gas mileage thread for 3.8/4.2 - Page 4 - TCCoA Forums

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post #91 of 117 (permalink) Old 07-17-2011, 08:03 PM
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Originally Posted by pettyfog View Post
Last week though I really got my eyes opened. Driving our Bravada {Blazer} I had set the cruise to 70 and decided to check my instantaneous fuel usage and I was pissed it was only 19 mpg, even going down a slope never got to 30. And up-slope was 15
I reset the cruise control to 65 and WOW.. reading went right up to 22-23 on the flat and well over 30 on down slope, up-slope 17.

Really I knew that the slow down-save fuel worked more for a rolling box than our slippery birds but 20% for 5 mph is something else!
I want to experiment with this too, dropping down to 55-60 mph or so to see how different it is. It's tough for me though when the speed limit is 75, I hate being the guy in the way and on a 700 mile trip slowing down that much adds a lot of driving time. Now in Utah they even have 80 MPH zones here and there spread over the state.

-Kelly
===================================
Fuelly
94 LX 3.8L NA : Daily Driver. 270k on chassis, 10k on motor.
90 35th Anniversary SC : Stored for the Winter.
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post #92 of 117 (permalink) Old 07-31-2011, 06:53 PM
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New Numbers

I just drove to Utah so these are pure highway MPG's. Temp was right around 100 degrees average on the trip and a lot of hills. Gas was 89 octane. Because of the temp the AC was on all the time. Average speed was ~70.

2422.7-2642.2=219.5 /9.394 = 23.37 (Chandler to Kingman)
2642.2-2868.9=226.7 /11.119 = 20.39 (Kingman to St. George)

I don't have the last tank because I didn't fill it up when I got here but estimating what's in the tank and miles it's right around 22 or so. I also just broke the 3100 mile mark on the rebuilt motor. I would guess maybe another 1800 miles and that will be the best it gets. I'm pretty sure with all highway, no AC, cruise, I could get it back to 27 or so. When I go back to Arizona next time I won't need the AC till I get down in the valley and it's more downhill so the numbers will be better. When I go back I'm going to try one tank going 55 mph and see how much of a difference it is.

-Kelly
===================================
Fuelly
94 LX 3.8L NA : Daily Driver. 270k on chassis, 10k on motor.
90 35th Anniversary SC : Stored for the Winter.
Needs Harmonic Balancer, complete suspension overhaul.
WTB: 90 SC BHJ harmonic balancer

Last edited by BlueEyes; 07-31-2011 at 06:58 PM.
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post #93 of 117 (permalink) Old 08-20-2011, 07:14 PM
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Ok wtf I'm getting 11 what's wrong with my car.

1993 3.8 N/A
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post #94 of 117 (permalink) Old 02-02-2012, 11:38 AM
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I saw this on another persons post and signed up for it. The site is called Fuelly and lets you enter all the MPG info and keeps track of everything. Click on the image and you can see all the stats.

Best so far was 27.5 Highway but it's been as low as 11 City. I'm going to start adding in the cost per gallon and you can put notes in for each fill up like average temp, octane used etc. I didn't keep good track of the Highway vs. City miles so I didn't enter any of that info yet. I'll start putting more detail into it from now on. Some of them may not be 100% accurate either, sometimes I'll run up to the store and forget the GPS but it's pretty accurate overall.


Fuelly

-Kelly
===================================
Fuelly
94 LX 3.8L NA : Daily Driver. 270k on chassis, 10k on motor.
90 35th Anniversary SC : Stored for the Winter.
Needs Harmonic Balancer, complete suspension overhaul.
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post #95 of 117 (permalink) Old 02-02-2012, 12:40 PM
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Quote:
Originally Posted by BlueEyes View Post
I saw this on another persons post and signed up for it. The site is called Fuelly and lets you enter all the MPG info and keeps track of everything. Click on the image and you can see all the stats.

Best so far was 27.5 Highway but it's been as low as 11 City. I'm going to start adding in the cost per gallon and you can put notes in for each fill up like average temp, octane used etc. I didn't keep good track of the Highway vs. City miles so I didn't enter any of that info yet. I'll start putting more detail into it from now on. Some of them may not be 100% accurate either, sometimes I'll run up to the store and forget the GPS but it's pretty accurate overall.


Fuelly
I got 24.1MPG combined on my last tank.

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post #96 of 117 (permalink) Old 02-02-2012, 12:57 PM
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I just cleaned my MAF which I kept forgetting to do because I didn't have the tamper-proof star bit but finally got one. I'm getting ready to head back to Utah so I should have some good MPG's the next 3 or 4 fill ups.

-Kelly
===================================
Fuelly
94 LX 3.8L NA : Daily Driver. 270k on chassis, 10k on motor.
90 35th Anniversary SC : Stored for the Winter.
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post #97 of 117 (permalink) Old 02-02-2012, 01:01 PM
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Recently I've been getting 19-20 city and 24-25 highway here in the colder weather. The brake booster has a small vacuum leak and I also have an exhaust leak, so if ever I get around to fixing those I expect my numbers should go up some.

Here's my fuelly, which I'll update whenever I remember to.

Fuelly

-Brandon
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post #98 of 117 (permalink) Old 02-02-2012, 01:20 PM
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According the the govt MPG site www.fueleconomy.gov the 94 LX 3.8L auto using regular gas was supposedly 17 City, 24 Highway, 19 Combined. I don't know what was originally on the window sticker though. I believe this is the adjusted rate they changed recently. So I'm pretty close to the estimate. I hope I can continue to get 27 highway though, that would be awesome.

-Kelly
===================================
Fuelly
94 LX 3.8L NA : Daily Driver. 270k on chassis, 10k on motor.
90 35th Anniversary SC : Stored for the Winter.
Needs Harmonic Balancer, complete suspension overhaul.
WTB: 90 SC BHJ harmonic balancer
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post #99 of 117 (permalink) Old 02-22-2012, 08:24 PM
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'93 3.8L
As with the others above, I usually get ~18 around town and ~24-26 on the highway.
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post #100 of 117 (permalink) Old 03-30-2012, 03:59 PM
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4.079 gallons to travel 127 miles (mileage from Google maps, not woefully inaccurate odo) for about 31 mpg. Freeway travel @ mostly 2000 RPM. Some short hills, mostly flat at ~300 ft above sea level. Temp was in the mid-50s yesterday and traffic was light, so definitely optimal fuel mileage conditions.

Car is a 1990 base 3.8L with MAF conversion and '91 ECM. 3.27 rear and AOD, 225/60 R16s on SC wheels. ~129k on motor, ~24k since head gasket job.

Just got this car back on the road after it sat engineless for a couple of years. Looking forward to seeing what sort of mileage it will be getting in town, hopefully better than my 5.0l was doing.

Josh Keady

1994 Super Coupe ('93 5.0L swap), 1990 Tbird 3.8L, 1982 Honda CB900F, 1972 F-100 SportCustom 4x4, 1970 Chevy Custom Camper / 20
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post #101 of 117 (permalink) Old 03-30-2012, 07:19 PM
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Originally Posted by Josh_Keady View Post
4.079 gallons to travel 127 miles (mileage from Google maps, not woefully inaccurate odo) for about 31 mpg. Freeway travel @ mostly 2000 RPM. Some short hills, mostly flat at ~300 ft above sea level. Temp was in the mid-50s yesterday and traffic was light, so definitely optimal fuel mileage conditions.

Car is a 1990 base 3.8L with MAF conversion and '91 ECM. 3.27 rear and AOD, 225/60 R16s on SC wheels. ~129k on motor, ~24k since head gasket job.

Just got this car back on the road after it sat engineless for a couple of years. Looking forward to seeing what sort of mileage it will be getting in town, hopefully better than my 5.0l was doing.
How fast were you driving?

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post #102 of 117 (permalink) Old 03-30-2012, 09:04 PM
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My speedometer is way off (wrong gear) but I was keeping up with most traffic and passing some so between 65 and 70, dropping down to 60 - 65 in a couple of 5 mile stretches. Just tried to be super gentle on the throttle, never forced a downshift, AC off (well, still discharged), tires inflated to about 36 PSI all around. If someone wants to do the math to figure out how fast I was going at 2k rpm with those gears / tires and an AOD, that'd be cool.

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post #103 of 117 (permalink) Old 04-01-2012, 10:38 AM
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Hey Josh, your tire size should measure 26.63 inches tall, 3.27 rear with .67 OD, at 2000 engine rpm you would be traveling at 72.3 miles per hour.
Hth's


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post #104 of 117 (permalink) Old 04-01-2012, 12:30 PM
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Not bad! I've gotten 35+ driving 55-60 but I think 72 sounds much better. Its the balance between saving money and actually getting there in a reasonable period of time I guess.

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post #105 of 117 (permalink) Old 09-06-2012, 10:47 PM
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13 city
19-20 hwy (60 mph)

16psi w/3.73 TL (stats in my sig)

Ethanol is a *****. I get almost 2.5 mpg worse with a measly 10% blend. I drove for 2 weeks on regular and got 14 city and 22 hwy (in the exact same conditions)

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post #106 of 117 (permalink) Old 09-06-2012, 11:52 PM
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I got 46MPG when my car was running on 5cyl, not good though. Normally I average around 25...

Better than the 19 I get from my Mustang.

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post #107 of 117 (permalink) Old 10-01-2012, 02:00 PM
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Engine: 3.8 Supercharged
City MPG: N/A
Highway MPG: 23-27
Fuel Used: unleaded regular
Average highway speed: 60
Average Climate: 20F - 90F N. Indiana
Mechanical Mods: Stock
Mileage on the Engine: 167k
Comments: 23 combined in winter 27 in summer (drive 55 miles round trip each day mainly rural with some city driving)
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post #108 of 117 (permalink) Old 10-01-2012, 11:06 PM
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Quote:
Originally Posted by Excellent XR-7 View Post
Engine: 3.8 Supercharged
City MPG: N/A
Highway MPG: 23-27
Fuel Used: unleaded regular
Average highway speed: 60
Average Climate: 20F - 90F N. Indiana
Mechanical Mods: Stock
Mileage on the Engine: 167k
Comments: 23 combined in winter 27 in summer (drive 55 miles round trip each day mainly rural with some city driving)
You are aware that SC's don't particularly like regular right?

-1996 Pearl White Thunderbird 4.6 Sport 4v with many mods:
Current Best: 13.583 @ 103.74 10/2014.
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-2001 White Ford F-250 Super Duty 6.8 V10, 4-door, 4x4, Limo Tint, BFG KO2's, Bilstein 7100 Remote Reservoir Race Bypass Shocks, 6" Spring lift, Kenwood Double Din, K&N Intake, FlowMaster Exhaust
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-2005 White GMC Sierra 3500 6.6 Duramax, Dually, 4-door, 4x4, Limo Tint, BFG Commercial T/A's, Rancho RS9000XL Shocks, Kenwood Double Din, K&N Intake, Banks Monster Exhaust
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post #109 of 117 (permalink) Old 10-02-2012, 01:56 PM
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Engine: 3.8 Supercharged
City MPG: so little driving, can't calculate
Highway MPG: 19-20 (would say combined)
Fuel Used: 98 octane/ 5% ethanol
Average highway speed: 60
Average Climate:near sea level
Mechanical Mods: 75mm tb, larce fmic and pipes, ported heads/intake/exhaust with 2.5" 5% OD pulley, Dirtydog 4r70w, stock converter, 3.27 lock diff, spitfire coilpack, QH/BE tuned
Mileage on the Engine: 145k but rebuilded and overbored 2k before
Comments: 245/45 18", 1.5" lowered. Dynoed before porting 257 hp.

Wish it would get better mileage, our gas price is 8.40$/gallon, and this is dd, trip to work 44mile/day. But ego doesn't fit in Yaris
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post #110 of 117 (permalink) Old 03-28-2013, 08:57 PM
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So I just drove from VA Beach to Nashville TN via North Carolina with plus 89 octane with 2 adults,1 kid ,2 guinea pigs , and luggage and just did that math with gas receipts and came up with 26.89 mpg. Not bad for a 3700 lb car that's 17 years old.

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post #111 of 117 (permalink) Old 03-28-2013, 09:28 PM
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What speed were you averaging?

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post #112 of 117 (permalink) Old 03-29-2013, 12:22 AM
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What speed were you averaging?
"Dunno, the speedometer pegs out at 85."

(No, not saying you were, JHiland32 - just cracking a bad joke.)

RwP
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post #113 of 117 (permalink) Old 03-29-2013, 06:37 AM
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What speed were you averaging?
65-70

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post #114 of 117 (permalink) Old 03-29-2013, 08:02 AM
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"Dunno, the speedometer pegs out at 85."

(No, not saying you were, JHiland32 - just cracking a bad joke.)

RwP
Yeah, it pegs out at 85 on my Mustang too.

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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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post #115 of 117 (permalink) Old 04-19-2013, 12:22 AM
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Engine:3.8
City MPG:18 15When I step on it
Highway MPG:27
Fuel Used:87
Average highway speed:65
Average Climate:Sunny
Mechanical Mods:None
Mileage on the Engine:Rebuilt motor but old pistons 180,000miles
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post #116 of 117 (permalink) Old 04-27-2013, 07:12 PM
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Engine: 3.8L

City MPG: 20

Highway MPG: 24

Fuel Used: 87 (I always fuel up in the morning though.)

Average highway speed: 80

Average Climate: GA, too hot or too cold.

Mechanical Mods: Spectre Intake, No mufflers, little bit of weight reduction.

Comments: When i have a full tank i drive faster, and vice versa.
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post #117 of 117 (permalink) Old 04-17-2014, 01:19 AM
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Engine: 3.8

City MPG: unknown

Highway: 32

Fuel: 87 non-ethanol

Speed: 65

Weather: mild, but windy (15-20 steady). Tail wind one way and head wind the other.

Mods: none

The car has well over 200,000 miles, but the odometer doesn't work anymore. Used a speedometer app on a smartphone to verify speed and log distance on a recent commute for work. Previous owner had replaced the head gaskets, but as far as I know the drivetrain is still original (meaning not rebuilt).

1993 Thunderbird
3.8 engine
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