Official 4.6L MPG thread - Page 5 - TCCoA Forums

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post #121 of 303 (permalink) Old 07-05-2008, 12:27 PM
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Quote:
Originally Posted by master486 View Post
Comments: Looking to get more highway MPG once I get the SCT PRP
Oh you will

if i can get 25-27mpg highway with cams and 3.27s, then you with PI cams should fair much better
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post #122 of 303 (permalink) Old 07-13-2008, 12:06 AM
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Location: Virginia Beach, VA
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Engine: 4.6L
City MPG: 17
Highway MPG: 28
Combined MPG: 21
Fuel Used: 89
Average Highway Cruise Speed: 70 mph
Average Climate: about 65 deg. F
Mods: MAC cold air induction
Mileage on the Engine: 98,000
Comments: There's too many darn traffic lights around here and other people don't know how to drive. My right foot tends to fall asleep and get heavy if you know what I mean. Use cruise control on the highway. Highway MPG was when I drove from NY to VA one time.

Last edited by Mgino96tbird46; 11-30-2009 at 08:07 PM.
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post #123 of 303 (permalink) Old 07-28-2008, 08:41 PM
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Location: Eastern Iowa
Age: 29
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Engine: 4.6
City MPG: 17
Highway MPG: 25
Fuel Used: 91
Average highway speed: 60
Average Climate: iowa...
Mechanical Mods: CAI, U/D pulleys, 75mm T/B and Plenum, Dynomax exhuast kit
Milage on the engine: 120,000
Comments: Use cruise and don't use the heavt foot
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post #124 of 303 (permalink) Old 08-08-2008, 11:15 PM
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When I brought the car home from Richmond, Indiana (about a 250 miles trip) and it only used a half tank of gas. So I would say on the highway my car gets around 27.7 mpg 85% hwy/ 15% city (500 miles per tank). In city on $10 (which is about 2.2 gallons) I can run about 50 miles (work and back twice) and wont reach empty. So I say about 20.1 city (work is all city driving).

Engine: 4.6
City MPG: 20.1
Highway MPG: 27.7
Combined MPG: 24
Fuel Used: 87
Average highway speed: 70
Average Climate: 82F (Chicago)
Mechanical Mods: None
Milage on the engine: ODO stopped working at 179000 so i would say about 220000 miles
Comments: No heavy foot and breaking early and lightly before stop signs and lights

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post #125 of 303 (permalink) Old 08-09-2008, 01:26 AM
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Location: Anaheim, Calif.
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Engine: 4.6L
City MPG: 19 to 20.5
Highway MPG: 26.4
Fuel Used: 87 octane
Average Highway Cruise Speed: 65 to 75
Average Climate: about 80 deg. F
Mods: None
Mileage on the Engine: 107,500
Comments: So cal stop and go freeway and around town driving mostly (A/C on most of the time)
At 72 mph cruise (with air and cruise control) on trips
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post #126 of 303 (permalink) Old 10-25-2008, 04:21 PM
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Location: Socal
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Engine: 4.6
70% Highway 30% City: 22 MPG
Fuel Used: 87
Average highway speed: 70
Average Climate: SOCAL
Mechanical Mods: Stock
Milage on the engine: Stopped working at 115k so im guessing like 130k
Comments: socal traffic sucks..!!!
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post #127 of 303 (permalink) Old 11-19-2008, 01:26 PM
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1995 Thunderbird LX
Engine: 4.6
90% Highway 10% City: 21 MPG
Fuel Used: 87
Average highway speed: 77
Average Climate: Central Alabama
Mechanical Mods: Stock
Milage on the engine: 193,000

Glen "RustyUL" Weldon

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post #128 of 303 (permalink) Old 11-19-2008, 06:55 PM
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Engine: 4.6
City MPG: 17.5 (18mph average speed--truly stop-n-go driving)
Highway MPG: 29.7
Fuel Used: 93
Average highway speed: 79
Average Climate: hot
Mechanical Mods: see sig
Milage on the engine: 170k+
Comments: this is with more tweaking done to the tune.....i found that I actually get better fuel economy doing ~80mph vs 70mph (verified with a scangauge).....the cams that I have make that much more torque at 2500 RPMs than at ~2000.........the increase in city mpg has come by way of a tweaked shift schedule that holds 2nd and 3rd just a tad bit longer than before, so the engine can operate in it's torque band a greater majority of the time
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post #129 of 303 (permalink) Old 01-15-2009, 09:36 AM
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Engine: 4.6
City MPG: 17-20 (ave. 18.5)
Highway MPG: 24-29 (ave. 26)
Fuel Used: 87
Average Highway Speed: 70
Average Climate: 80s in summer, 20s in winter
Mechanical Mods: None
Mileage on the Engine: 106,500
Comments: Hopefully after I get all the car's minor issues sorted out I can squeeze some more MPG out of the engine.
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post #130 of 303 (permalink) Old 02-02-2009, 12:19 PM
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Engine: 4.6L SOHC
City MPG: 16-18 MPG <--- this is 75% of what I drive per tank.
Highway MPG: 20-25 MPG <--- this is 15% of what I drive per tank.
Fuel Used: 89
Average highway speed: 65-70
Average Climate: Cold Morning, average 65*F daytime, Cloudy, Sunny,
Mechanical Mods: K&N, Synthetic otherwise stock...
Milage on the engine: As of 2/1/2009 - 131,355
Comments:

I swapped my diff. for a 3.08 gears instead of 3.27, and I got 29 MPG on highway + city driving! But I swapped back to 3.27 gears with TL. hehe =)

Gas Buddy Link

If you guys don't know about Gas Buddy, you should check it out. You are able to find the cheapest gas around your area, where ever you live in the USA. And also, it has a handy fuel logger database, where you can keep track of all your fuel purchases. Here is a picture of a snapshot I took of my fuel graph. You can see where I swapped out the 3.27 for the 3.08 gears and got 29MPG! wee!

Here's a link to my fuel chart.

~1997 TBIRD 4.6L LX SPORT ~ Xenon Kit ~ 149K Miles ~ K&N ~ JMOD ~ Daily Driver
~1991 TBIRD 5.0L HO ~ Completely Stock ~
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post #131 of 303 (permalink) Old 02-05-2009, 10:25 AM
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Age: 27
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Engine:4.6
City MPG:17
Highway MPG:20
Fuel Used:cheap stuff
Average highway speed:umm gov much?
Average Climate:cold
Mechanical Mods: k&n filter and flomasters
Milage on the engine:120+
Comments: had a tracker and i miss the milage
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post #132 of 303 (permalink) Old 02-11-2009, 11:51 AM
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Anyone using 0w30? I have used it in the Cougar, but didn't track the mileage compared to 5w30. I do know that my '04 Thunderbird gets over 23 MPG over with 0w20 and no more than 22 with 5w20. Even after 5000 miles with 0w20 and then switching to 5w20, I got worse gas mileage. I had to switch back because Mobil 1 ran out due to Hurricane Ike.


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Current Modifications:
Air intake/9inch cone filter
Modified MAF (post cut out, sampling tube drilled to 29/64")
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Modifications soon to be put in:
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post #133 of 303 (permalink) Old 02-12-2009, 02:23 PM
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Quote:
Originally Posted by funnyfingers View Post
Anyone using 0w30? I have used it in the Cougar, but didn't track the mileage compared to 5w30. I do know that my '04 Thunderbird gets over 23 MPG over with 0w20 and no more than 22 with 5w20. Even after 5000 miles with 0w20 and then switching to 5w20, I got worse gas mileage. I had to switch back because Mobil 1 ran out due to Hurricane Ike.
The 1997 and older motors are not designed to run the thin 0W oil. I am sure people do it, but I wouldnt. I am also sure mileage would go up accordingly.

When I switched from 10W-40 to 10W-30, I noticed a nice mileage increase in an old Nissan, and have used 10W-30 ever since.

I also always notice a mileage increase in the Ford after just changing the oil with the same type. Food for thought for when gas was $4 - then it might be worth changing it every 2500 miles, 3000 at the most.

Al

97 T-Bird LX 4.6 - 68k miles
94 Supra TT Auto - street/strip car
04 Crown Vic Police Interceptor - Brenda's car
Previous cars:
95 T-Bird LX 4.6 - fully optioned, owned 15 years
96 Cougar XR-7 4.6- Brenda's car, owned 11 years
88 T-Bird 3.8 - first T-Bird, owned 5 years
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post #134 of 303 (permalink) Old 02-12-2009, 02:34 PM
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Quote:
Originally Posted by T6Rocket View Post
The 1997 and older motors are not designed to run the thin 0W oil. I am sure people do it, but I wouldnt. I am also sure mileage would go up accordingly.
Just so you know, there is no difference between the way the motors were built before or after 97. Internally the motors have the exact same parts with the exact same bearings and the exact same clearances. If you can run 0W oil in a newer 4.6, then you can also run it in an older 4.6. Personally, I would never run that light an oil in anything. I think the protection that some 10-30 gives you is worth more than what you would save in gas.

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post #135 of 303 (permalink) Old 02-12-2009, 06:35 PM
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Also like I said mileage went down from 0W20 5000 mile old oil to brand new 5w20 both mobil 1 full synthetic in my tbird. And a switch from 5w30 to 0w20 isn't like switching from 10w40 to 30. You went down real weight.


15.3s@89.97 mph
Current Modifications:
Air intake/9inch cone filter
Modified MAF (post cut out, sampling tube drilled to 29/64")
99 GT PBR Brakes with cross-drilled slotted rotors
Modifications soon to be put in:
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post #136 of 303 (permalink) Old 02-13-2009, 07:49 AM
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Quote:
Originally Posted by MadMikeyL View Post
Just so you know, there is no difference between the way the motors were built before or after 97. Internally the motors have the exact same parts with the exact same bearings and the exact same clearances. If you can run 0W oil in a newer 4.6, then you can also run it in an older 4.6. Personally, I would never run that light an oil in anything. I think the protection that some 10-30 gives you is worth more than what you would save in gas.

All I know is my engine guy built my 2JZ engine purposely with the tolerances on the loose side, and said the minimum oil I should run is 10W-40, instead of the 10W-30 required on a bone stock motor.

I take that to mean since there is more space between the parts, you need a thicker film of oil for protection, and that oil recomendation is directly proportional to engine tolerances.

I would like to see proof that the clearances are not tighter on the newer motors that require 5W-30 oil, especially Honda motors.

Al

97 T-Bird LX 4.6 - 68k miles
94 Supra TT Auto - street/strip car
04 Crown Vic Police Interceptor - Brenda's car
Previous cars:
95 T-Bird LX 4.6 - fully optioned, owned 15 years
96 Cougar XR-7 4.6- Brenda's car, owned 11 years
88 T-Bird 3.8 - first T-Bird, owned 5 years

Last edited by T6Rocket; 02-13-2009 at 08:11 AM.
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post #137 of 303 (permalink) Old 02-13-2009, 08:14 AM
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Location: Omaha, NE
Age: 26
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Engine: 3.8 n/a
Average MPG: 17-19
Fuel Used: 91 or sometimes 89 from BP
Average highway speed: 55 (inner-city interstate)
Average Climate: Omaha doesn't have an average climate!
Mechanical Mods: None
Milage on the engine: 140,000
Comments: Most of the 4.6's are getting the if not better than my 3.8. I dispise the V6 (2009 honda 1.8l has the same hp) would a swap to the 4.6 or supercharging be better? (and which would be cheaper)
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post #138 of 303 (permalink) Old 02-14-2009, 06:27 PM
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T6Rocket, like I said the 40 is thicker than the 30. If an engine required 40 you shouldn't put 30 in. The winter weight is different though.


15.3s@89.97 mph
Current Modifications:
Air intake/9inch cone filter
Modified MAF (post cut out, sampling tube drilled to 29/64")
99 GT PBR Brakes with cross-drilled slotted rotors
Modifications soon to be put in:
3.73 ring and pinion (used)
Trac-Loc Differential (used)
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post #139 of 303 (permalink) Old 02-14-2009, 06:32 PM
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sdavis - That seems pretty low. Is your gas E10 or is it higher, being from Omaha the corn state. I know they call their state disability system CornHusker


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Current Modifications:
Air intake/9inch cone filter
Modified MAF (post cut out, sampling tube drilled to 29/64")
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Modifications soon to be put in:
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post #140 of 303 (permalink) Old 02-18-2009, 11:26 PM
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Something is definitely wrong here.

I recently did three trips in the last week that were about 90% highway each (NY to DC - 270 miles, DC to NJ - 230 miles, and NJ to DC - 210 miles).

Speed was an average 75-80 MPH. I run 89 octane, and despite it being winter gas, my MPG for all three trips was less than 20. About 19 and change.

That was with a change to clean oil (Motorcraft 5W30) and a Seafoam treatment right before the NY-DC trip.

My city mileage (I've been keeping track for the last year or two) is in the low 14s. Even with summer gas, my highway mileage (I took a road trip to Pennsylvania and back) was sub-20.

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post #141 of 303 (permalink) Old 02-19-2009, 08:00 AM
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Quote:
Originally Posted by alicks View Post
Something is definitely wrong here.

I recently did three trips in the last week that were about 90% highway each (NY to DC - 270 miles, DC to NJ - 230 miles, and NJ to DC - 210 miles).

Speed was an average 75-80 MPH. I run 89 octane, and despite it being winter gas, my MPG for all three trips was less than 20. About 19 and change.

That was with a change to clean oil (Motorcraft 5W30) and a Seafoam treatment right before the NY-DC trip.

My city mileage (I've been keeping track for the last year or two) is in the low 14s. Even with summer gas, my highway mileage (I took a road trip to Pennsylvania and back) was sub-20.
Every car has a 'sweet spot' for MPG, after which the increases in speed cause your MPG to drop like a rock. I'm not sure what the bird's peak MPG efficiency speed is, but it's likely around 55 MPH. At 75 MPH, you're getting about 15% less fuel economy than you are at 60. At 80, that would be even worse. So with a little math, at 19 MPG running 80 MPH, theoretically you'd be getting 22 or better MPG at 60 or MPH. That goes right in with my MPG; I took a 240 mile round trip this Sunday, 90% highway and got 21.9 MPG with an average speed of about 65 (alternating between 60 and 70 on different highways). I also have been getting 15-18 MPG city lately. I expect that to jump up to the mid-high 20s and low 20s, respectively, when the warm air returns. And I'm running the super cheap brandless 10W oil and 87 octane.

-Brandon
97 Laser Red Thunderbird LX 156k, Stage 2 4.6L 2v N/A | 300 BHP (255 RWHP, 290 RWTQ) | 13.95 @ 97.58 | Build details | Pics at the Lorain Assembly plant
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post #142 of 303 (permalink) Old 02-19-2009, 08:02 AM
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funnyfingers- I thinks it's just my heavy foot and mainly city driving. On the highst I got was when I took a roadtrip one day to pisgah, ia. I think I got like 23... but that tank was still mostly city. I think the 89 is E10, I don't know about 91.
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post #143 of 303 (permalink) Old 03-27-2009, 07:57 AM
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Location: Minnesota
Posts: 9
Engine: 4.6L
City MPG: 18
Highway MPG: 25
Combined MPG: 21
Fuel Used: 87
Average Highway Cruise Speed: 65 MPH
Average Climate: 20* - 100* F, ever changing
Mods: JMOD, Glasspack mufflers, air silencer delete, K&N Panel filter
Mileage on the Engine: 130,000

97 4.6L Thunderbird Sport
middle setting Jmod
silencer delete
k&n panel filter
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post #144 of 303 (permalink) Old 04-05-2009, 12:55 PM
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Summer Gas! Yea!

Went thru the first two tanks of summer gas last week, and mpg went from ~20 to over 25mpg, both cars!

I've been trying to figure out what the deal was for a while, because the gas mileage has been crap since last summer... Apparently, the gas here has been crap since last summer.

Prices here jumped last week to 2.19 for premium, and that was the change to good gas.

The guy that checks the pumps is an old-timer with the company, and said that below $2 a gallon, they use more alcohol instead of more expensive additives... IDK if that's true, but he has a fleet of old cars he keeps, and supposedly the only reason for this particular gas station is for his cars. (small town, huh? ) It's much better gas than everywhere else, and it doesn't usually have alcohol in it. My bikes hate it when I fill them on a ride somewhere...

5 mpg for .20 cents is a good deal for me, lol.

Red '96 Cougar XR-7 240k mi. '02 4R70W, PST DS : '03 PI engine, 04 maf, 24lb injectors, 2.5" exhaust, '02 4r70w + Jmod, DirtyD0g TC + cooler + 3/8" lines, 255 walbro fp. Alpine system.
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post #145 of 303 (permalink) Old 05-05-2009, 08:18 PM
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I drove from Omaha to KC, around town a bit, and back home on nearly a single tank (375-400 miles, or around there). I had to refill in Council Bluffs, I probably could have made it across the river, but it was getting late and I didn't want to worry about it. Did just shy of 26 mpg. That's the best I've I done.
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post #146 of 303 (permalink) Old 05-27-2009, 09:04 PM
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Best I ever did was just shy of 30. Took a 245 mile round trip on less than a half a tank. Boy, did it ever surprise me.

-Brandon
97 Laser Red Thunderbird LX 156k, Stage 2 4.6L 2v N/A | 300 BHP (255 RWHP, 290 RWTQ) | 13.95 @ 97.58 | Build details | Pics at the Lorain Assembly plant
96 Ivory Mark VIII 235k, stock 4.6 32v on coils; New engine at 185k
Gone but not forgotten: 94 Cougar XR7, 93 Mark VIII

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Once you have tasted flight, you will walk the world with your eyes turned skyward, for there you have been and there you long to return. -Leonardo da Vinci
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post #147 of 303 (permalink) Old 05-27-2009, 11:24 PM
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Location: Boca Raton, FL
Posts: 16
Engine: 4.6L
City MPG:15
Highway MPG: 21
Fuel Used: Whatever regular is around
Average highway speed: 80
Average Climate: Florida... is hot
Mechanical Mods: Cold air intake, Flowmaster exhuast
Milage on the engine: 35,000
Comments: I have no idea what's wrong with my gas mileage. Anyone care to shed some light?
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post #148 of 303 (permalink) Old 05-28-2009, 02:56 AM
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Guess I'll update since my car has changed a bit

Engine: 4.6L
City MPG:18
Highway MPG: 26
Fuel Used: Premium 93
Average highway speed: 80
Average Climate: warm-hot currently
Mechanical Mods: PI intake, 80mm maf, #24 injectors, True duals with high flows, semi J-spec 2000 GT trans, 3.55 gears, Tune(by me), 255mm tires, ~100 lbs of total weight removed
Mileage on the engine: 87,000
Comments: Tuning made the biggest impact and I'm still learning as I go.

-Matt
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post #149 of 303 (permalink) Old 07-06-2009, 07:08 PM
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95 Mark VIII
City MPG: N/A
Highway MPG: 27.1
Fuel Used: Premium
Average highway speed: 70
Average Climate: roughly 65-70
Mechanical Mods: stock motor, removed air silencers; stock 2 cats dual 2.5" double x pipe midmounted, slight jmod
Mileage on the engine: 158K
Comments: yay

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post #150 of 303 (permalink) Old 07-06-2009, 09:37 PM
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1996 tbird lx 4.6
city 14 mpg.
highway 20 mpg
75 mph highway mph
mods sc 3.73 gears 400 hp to the tires

1995 tbird
4.6
150k miles
stock 3.27 gears
city 17 mpg
highway 26 mpg
80 mph average
blown96bird is offline  
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