Official 4.6L MPG thread - Page 7 - TCCoA Forums

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post #181 of 303 (permalink) Old 10-14-2010, 04:31 PM
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Engine: 4.6 V8
Combined MPG: 21
City MPG: not in the city enough
Highway MPG: 24 with the cruise on.
Fuel Used: 87
Average highway speed: around 70
Average Climate: moderate mid Atlantic
Mechanical Mods: All stock
Mileage on the engine: around 15,000mi when I last checked

93 Tempo GL 3.0 V6
97 T-Bird LX Limited Ed 4.6 V8

Last edited by the keifer; 10-14-2010 at 05:33 PM.
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post #182 of 303 (permalink) Old 10-14-2010, 04:37 PM
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Nice bird you have Keifer But your Hwy mileage I would think should be higher mine was getting 27 to 28 before my Mods , Maybe yours just needs to get broke in more
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post #183 of 303 (permalink) Old 10-14-2010, 05:06 PM
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Baseline (before mods)

Engine: '95 4.6
Combined MPG: 19
Highway MPG: 23
Fuel Used: 87
Average highway speed: 65
Average Climate: Midwest (Summer)
Mechanical Mods: none
Mileage on the engine: 75,000
Comments: Stock power train, 3.08 rear gears

After mods:

Engine: '95 4.6
Combined MPG: 21
Highway MPG: 22.5
Fuel Used: 91/93
Average highway speed: 65
Average Climate: Midwest (Summer)
Mechanical Mods: PI Headswap, 3.27 rear gears
Mileage on the engine: 80,000
Comments: Tuned for 91 octane due to that being all that is available in some areas I drive

2011 Dodge Durango Crew 5.7L HEMI

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post #184 of 303 (permalink) Old 10-14-2010, 05:28 PM
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I'm getting the worst millage here for reasons unknown, I haven't done the math but
with my 4.10 ,pi heads,intake , true duals I was getting 250 miles per 14-15 gallons.

now with the stock 3.27's i'm getting 225miles if I'm lucky mostly driving 70 mph on the freeway.

I'm pissed about this now. when I run my stock tune I got pinging, with the tune no pinging and I can let them tires burn for a little while flooring it with the 3.27's.

I'm going to go back to the stock tune next fill up and see if i can get my 300 miles per tank like how it used to be but I doubt it.

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60'...... 2.06
1/8th .. 9.194
mph .... 77.13

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post #185 of 303 (permalink) Old 10-14-2010, 05:31 PM
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Originally Posted by ThunderChecken View Post
Nice bird you have Keifer But your Hwy mileage I would think should be higher mine was getting 27 to 28 before my Mods , Maybe yours just needs to get broke in more
Thanks!
Yeah, I only had it on one long trip the whole time I had it. That's when I got 24 out of it. Other than that, it gets around 21 on avg. It's less than 20,000 mi old right now.
These cars do pretty good for V8s MPG wise.

93 Tempo GL 3.0 V6
97 T-Bird LX Limited Ed 4.6 V8

Last edited by the keifer; 10-14-2010 at 05:36 PM.
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post #186 of 303 (permalink) Old 10-14-2010, 05:35 PM
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Quote:
Originally Posted by cjchevez View Post
I'm getting the worst millage here for reasons unknown, I haven't done the math but
with my 4.10 ,pi heads,intake , true duals I was getting 250 miles per 14-15 gallons.

now with the stock 3.27's i'm getting 225miles if I'm lucky mostly driving 70 mph on the freeway.

I'm pissed about this now. when I run my stock tune I got pinging, with the tune no pinging and I can let them tires burn for a little while flooring it with the 3.27's.

I'm going to go back to the stock tune next fill up and see if i can get my 300 miles per tank like how it used to be but I doubt it.
250 miles per 14 gallons = 17.86 mpg

The 3.27s don't do that well city, but are good on the highway at a consistent 60mph.

2011 Dodge Durango Crew 5.7L HEMI

2001 Volkswagen Beetle GLX 1.8T
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post #187 of 303 (permalink) Old 10-14-2010, 07:33 PM
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I've been seeing 18-19ish on the Bird in the city after my mods, highway has been 23-25. Before the mods I was used to 20-21 city and 26-28 highway; saw as high as 30 once.

-Brandon
97 Laser Red Thunderbird LX 155k, 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 #188 of 303 (permalink) Old 10-14-2010, 10:35 PM
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Most mods shouldn't make you lose MPG. I just saw 29.8 MPG on a trip to/from Bakersfield, and still average about 27 MPG running A/C all the time.

--Chris

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post #189 of 303 (permalink) Old 10-15-2010, 12:38 AM
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I've noticed a modest increase around town, but very little change on the highway. 22.5 was the hwy mileage headed to/from Iowa several times. My drive to and from work is a good mix of city and highway and still a consistent 21 mpg from 19 before (but that was on 3.08s). I should have checked the mileage with the 3.27s before the headswap.

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post #190 of 303 (permalink) Old 10-25-2010, 05:21 PM
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Over 25 mpg...

Well, I had to take Daniela to the city today for a doctor's appointment to get her foot x-rayed and I decided to check the mileage. I used the Garmin since the odometer doesn't work (and I'm sure it's MUCH more accurate anyways). I also filled up on the same pump at the same station to make sure everything was exactly the same and more accurate.

Well, I reconnected the EGR valve and I guess it does increase the MPG quite a bit (3, 4, and 5th tanks were with it disconnected)...

UPDATE: Ok, after CAI added, I checked mileage on multiple tank fulls of fuel:
1st Tank: 26.1 Avg MPG
2nd Tank: 27.9 Avg MPG
3rd Tank: 25.4 Avg MPG (EGR disconnected)
4th Tank: 25.9 Avg MPG (254 miles on 9.8 gallons of fuel)
5th Tank: 25.5 Avg MPG (178.6 miles on 7.0 gallons)
6th Tank: 29.2 Avg MPG (213.2 miles on 7.3 gallons) (EGR RECONNECTED) some spirited driving - went to visit 'cobra R Thunderbird' in Tally.
7th Tank: 28.5 Avg MPG (356 miles on 12.5 gallons) all highway drove north of Clanton, Alabama.

Running Average: 27.3 MPG

~Rick
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Last edited by NetKeym; 08-30-2012 at 12:22 PM. Reason: Checked another tank full
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post #191 of 303 (permalink) Old 04-06-2011, 07:30 PM
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Last time I went from Murfreesboro, TN to St. Louis, MO which is about 350 miles door to door I can almost make it into the city limits on one tank doing 80mph. The book says 18 gallon tank but to be honest I don't think I've ever put more than a little over 16 gallons in it to fill it up. Which puts my mpgs at just under 22.. damn and you guys are averaging 25, 26?? I gotta have a clogged cat or something..

i put under-drive pulleys on and i felt like i picked up maybe 1 mpg but ill prob have my 373 gear before i can actually test it out which according to most ill loose another 2-3mpgs

-Patrick
9.63@77mph on used street tires
See profile for full list of mods

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post #192 of 303 (permalink) Old 04-06-2011, 07:34 PM
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After I put the front end together after replacing the LCAs I had about 4 degrees of toe in (according to the shop). According to my scangauge I was getting 20-21 MPG cruising at 40 MPH. On the way back after the alignment I was seeing 26-28, even with the 3.73s. So obviously a misaligned front end will cause your mileage to tank! Apparently the wider tires caused more grip on the road with the bad alignment creating more toe-in resistance for the vehicle to power through, which I guess explains my mileage drop after switching to the 255 wide tires.

-Brandon
97 Laser Red Thunderbird LX 155k, 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 #193 of 303 (permalink) Old 04-06-2011, 07:37 PM
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Quote:
Originally Posted by theterminator93 View Post
After I put the front end together after replacing the LCAs I had about 4 degrees of toe in (according to the shop). According to my scangauge I was getting 20-21 MPG cruising at 40 MPH. On the way back after the alignment I was seeing 26-28, even with the 3.73s. So obviously a misaligned front end will cause your mileage to tank!
Well, duh! Take a little matchbox toy car, bend the front wheels in slightly (to signify toe-in) and try to roll it. Hmmmmm. Funny how plowing takes so much work lol (also wears your tires on the outside edges).

Speaking of MPG, I gotta take some new readings since I've eliminated my EGR circuits (Daniela kept complaining the car was 'surging' and I knew that was the EGR system screwing up, so I disconnected it).

~Rick
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post #194 of 303 (permalink) Old 04-06-2011, 07:39 PM
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Yeah, I didn't have the mind to think of that until they told me I had a nasty case of toe-in. Amazing how much symptoms fit together when you know the problem! And my tires were actually wearing pretty bad on the inside, outside looks good.

-Brandon
97 Laser Red Thunderbird LX 155k, 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 #195 of 303 (permalink) Old 04-06-2011, 07:39 PM
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And I got back from RobertP's place today 180 mile round trip & SG said 28 mpg with my 3.73 and high HP
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post #196 of 303 (permalink) Old 04-06-2011, 07:42 PM
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Originally Posted by ThunderChecken View Post
And I got back from RobertP's place today 180 mile round trip & SG said 28 mpg with my 3.73 and high HP
Y'all running the Scan Gauges, are these numbers you're giving us the AVERAGE or just INSTANTANEOUS readings?

Quote:
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Yeah, I didn't have the mind to think of that until they told me I had a nasty case of toe-in. Amazing how much symptoms fit together when you know the problem! And my tires were actually wearing pretty bad on the inside, outside looks good.
That's different. Usually when inside wears, it's indicative of tires toed OUT too much (or too much negative camber).

~Rick
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post #197 of 303 (permalink) Old 04-06-2011, 07:43 PM
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I have mine set to give me instantaneous (the high figure I gave) as well as a trip average. I have yet to go on any trip of over 5 miles, so the highest average reading I've seen has been 21 (this is city driving).

-Brandon
97 Laser Red Thunderbird LX 155k, 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 #198 of 303 (permalink) Old 04-06-2011, 07:46 PM
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I have mine set to give me instantaneous (the high figure I gave) as well as a trip average.
Same here as well .
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post #199 of 303 (permalink) Old 04-06-2011, 07:47 PM
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I have mine set to give me instantaneous (the high figure I gave) as well as a trip average.
Well, that's CHEATING! lol All my figures are averages based on tank fulls (or close to). On my Dodge van, I can let off the gas going down the highway and my INSTANTANEOUS will read 99 mpg!

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post #200 of 303 (permalink) Old 04-06-2011, 07:50 PM
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True, but the figures I read out were the low and high averages while cruising. I suppose it'd equate to a highway average.

Once I go through the "proper" estimation procedures by filling up at the pump I'll update my MPG readings. But for now, the scangauge makes me happy.

-Brandon
97 Laser Red Thunderbird LX 155k, 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 #201 of 303 (permalink) Old 04-06-2011, 07:56 PM
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How much will old catalysts (over 100K miles) affect gas mileage?

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post #202 of 303 (permalink) Old 04-06-2011, 08:01 PM
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How much will old catalysts (over 100K miles) affect gas mileage?
That's hard to determine. If the vehicle ran well (for instance - I have a Dodge Caravan with 230,000 miles that I put a new bigger exhaust on it today and the cat was fine, so we reused it), it could last several hundred thousand miles. If the car burned oil badly, it may not last 100,000

Since I have a 1995 'Bird and it burned oil pretty badly when I first got it, I replaced my cats. Since I put the Motor Honey to it for a few months, it kind of stopped burning oil (that stuff worked better than I EVER expected). I still have to add oil, but very infrequently now for several months. Before the Motor Honey treatment(s) (as in SEVERAL bottles), I used to have to add a quart every couple weeks.

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post #203 of 303 (permalink) Old 04-18-2011, 12:40 AM
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mpg

Engine: 4.6l
City MPG: 17
Highway MPG: 26
Fuel Used:
Average highway speed: 72-75
Average Climate: 30's winter,90s summer
Mechanical Mods: quiet a few
Milage on the engine: 120k recently motor went down
Comments: replacing engine soon

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1994 Thunderbird lx 4.6
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post #204 of 303 (permalink) Old 04-18-2011, 01:27 AM
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tank of fuel = 500kms
chevy minivan was about 400kms with a 3.4l

Ford > chev
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post #205 of 303 (permalink) Old 04-22-2011, 08:41 AM
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Originally Posted by NetKeym View Post
Speaking of MPG, I gotta take some new readings since I've eliminated my EGR circuits (Daniela kept complaining the car was 'surging' and I knew that was the EGR system screwing up, so I disconnected it).
Expect worse gas mileage with the EGR gone. These cars get better mileage with a working EGR system - especially if you get a code for "excessive EGR flow".

Al

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post #206 of 303 (permalink) Old 04-22-2011, 12:23 PM
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I have only put 2 tanks of gas in her but here it goes....

Engine:4.6 2v
City/Highway combine MPG:18.6
Fuel Used:87
Average highway speed:65
Average Climate:50 degrees-ish
Mechanical Mods:none
Mileage on the engine:115,600
Comments:needs tune-up
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post #207 of 303 (permalink) Old 04-22-2011, 02:46 PM
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Quote:
Originally Posted by NetKeym View Post
That's hard to determine. If the vehicle ran well (for instance - I have a Dodge Caravan with 230,000 miles that I put a new bigger exhaust on it today and the cat was fine, so we reused it), it could last several hundred thousand miles. If the car burned oil badly, it may not last 100,000

Since I have a 1995 'Bird and it burned oil pretty badly when I first got it, I replaced my cats. Since I put the Motor Honey to it for a few months, it kind of stopped burning oil (that stuff worked better than I EVER expected). I still have to add oil, but very infrequently now for several months. Before the Motor Honey treatment(s) (as in SEVERAL bottles), I used to have to add a quart every couple weeks.
What he said. 94/5's that huff blue smoke tend to wipe them out around 100k. I usually run a bit of ATF in mine a few miles prior to an oil change to help swell the seals and clean out deposits, seems to preserve at least a quart of oil between changes.

-Matt
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post #208 of 303 (permalink) Old 04-22-2011, 03:42 PM
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What he said. 94/5's that huff blue smoke tend to wipe them out around 100k. I usually run a bit of ATF in mine a few miles prior to an oil change to help swell the seals and clean out deposits, seems to preserve at least a quart of oil between changes.
Wow, I aught to start doing this then because I am going through a quart of oil every 700-800 miles. My gas mileage has taken a hit since last year, I'm lucky if I get 24 on the highway. That's when I'm actually trying. Plugs (Autolite AR764) have about 15,000 miles on them. Wires are about 7 years old though. I regularly do the Seafoam treatment every 10,000 miles and I run 89 grade E10 gasoline. No CEL's, no driveability issues. New tires, transmission fluid of course. Air filter is cleaned every 10,000 miles. PCV valve isn't stuck. All the vacuum tubes have been replaced in the engine bay.

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1985 Mustang GT. modified stock Holley 4180C, Weiand Street Warrior intake manifold, equal length headers, true dual exhaust, 5 speed, 3.55:1 8.8'' rear end, Ford Racing 10.5" clutch.

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Last edited by Mgino96tbird46; 04-22-2011 at 03:50 PM.
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post #209 of 303 (permalink) Old 07-08-2011, 10:00 AM
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1995 Cougar
Engine: 4.6 SOHC
City MPG: 11
Highway MPG: 24-25
Fuel Used: 93 octane
Average highway speed: 80-90
Average Climate: 70s
Mechanical Mods: a few.
Milage on the engine: 166k
Comments: OD likes to kick on and off so I usually just turn it off when I'm not on the highway. And the 3500 tq converter makes a pain in the arse to launch in city.

Last edited by TheNightWolf; 07-08-2011 at 01:31 PM.
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post #210 of 303 (permalink) Old 09-13-2011, 09:51 PM
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Engine: 4.6 PI
City MPG: 15
Highway MPG:18
Fuel Used: 93 octane
Average highway speed: 105mph
Average Climate: Michigan so different every day
Milage on the engine: around 50k, not even 100 miles on heads and cams
Comments:Brand new heads cam intake true dual CAI
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