Topic: Gas Mileage Thread

[the idiot magnet]

Just filled up this morning and did my calculations. I'm just a bit over 18MPG with a 2.5L 5 spd 4.10's 31" M/Ts, 1" body lift, hard top, and lots of added extra steel. Mileage is highway and city combined for a daily driver.
Depending on my driving habits I average 17 to 19 and that's important to know since the gas guage always reads full. Need to fix that.

[Erik]

10MPG on the dot
1989 2.5 TBI 4 Banger
Manual 5 Speed AX-5 Tranny
39.5x18" Boggers
5.38 Gears
Speedometer Calibrated
Snorkel, borla header, no cat, 2.25" flowmaster 40

[aw12345]

darn at 10 mpg you can drive a crewcab dually my old carburated f350 dually would get 13.5 on the highway and about 8-9 in the city. You might want to do something about that uits a lot of gas for a little 4 banger

Art

[jung4g]

I get around 13 I think...

That's with Hardtop and full doors on (winter mode).

Running 32 x 11.50s
4.10 gearing
2.5 MPI
AX5
K&N with cut box
Electric Fan
4.0 TB
Dynomax Catback w/ Hi-Flow Cat

[6099]

18.5MPG

Transmision Type **AX5

Engine Type **2.5 MPFI

Tire Size **34"

Differential Gearing **7.1

Speedometer Calibration **GPS calculated

List of ENGINE Mods if any **4.0TB, no CAT, K&N in stock airbox. Header, stock.

[Mozman68]

Differential Gearing **7.1

Wha wha whaaaaaa?

[chrisfranklin]

This is the official gas mileage thread.  So, post your mileage.  Here are some stipulations though.  Please post in the thread this additional information.
About 16mpg city, 18-19mpg highway.  Used to run 20mpg highway on 205s

Transmision Type: AX-5
Engine Type: AMC 2.5L MPFI
Tire Size:  235/75/15,  roughly 29s
Differential Gearing: 4.10
Speedometer Calibration: No (Checked vs. GPS and it seemed right on the money)
List of ENGINE Mods if any: Borla exhaust, Full PD Ignition, Autolite Iridium plugs, Mobil 1, 62mm TB, TB spacer, air box restrictions pulled. 
Weight: Have 20 gallon gas tank mod which probably ads only 30lbs to vehicle weight on a full tank; no other significant weight additions such as winch, bumpers, racks, armor, larger axles, etc.
 
 
 

[Jeffy]

Differential Gearing **7.1

Wha wha whaaaaaa?

He's running Volvo axles 7:1 is correct.

[Mozman68]

Differential Gearing **7.1

Wha wha whaaaaaa?

He's running Volvo axles 7:1 is correct.

aaahhhhh...Mr. South America......we need more pics....

[Liljeepz]

16 MPG here

2.4L
31x10" tires
4.11 gears
speed-o gear is not changed yet.

[Elyod]

I just replaced my paper air cleaner with a drop in K&N for the 4.0 litre and my mileage went up to 22.5 from 17. My older one was a little dirty but almost 6 mpg is nuts!  Definitely worth the 60 bucks.

[Sidscan]

I just replaced my paper air cleaner with a drop in K&N for the 4.0 litre and my mileage went up to 22.5 from 17. My older one was a little dirty but almost 6 mpg is nuts!  Definitely worth the 60 bucks.

Wow that's quite a change.  My best mileage is 17 and everything seems pretty well tuned.  What other secrets do you have?  I'm thinking you must drive down hill both ways.    I would be interested to hear your average MPG over a 6 month span.  You continue to get the 22 pretty consistantly, then I'm all in.  Thanks for postin 

[Jeffy]

I just replaced my paper air cleaner with a drop in K&N for the 4.0 litre and my mileage went up to 22.5 from 17. My older one was a little dirty but almost 6 mpg is nuts!  Definitely worth the 60 bucks.

Wow that's quite a change.  My best mileage is 17 and everything seems pretty well tuned.  What other secrets do you have?  I'm thinking you must drive down hill both ways.    I would be interested to hear your average MPG over a 6 month span.  You continue to get the 22 pretty consistantly, then I'm all in.  Thanks for postin 

Well, you can't really say the K&N did anything since he never tried a clean paper element first.  If any filter is really dirty it will reduce power.  Was the filter worth $60, maybe maybe not.

[Elyod]

I have had the paper filter in there for a year, when i got it, it was new (I hope) and i still only got around 18~19 mpg.  I have owned my jeep for four years now and have never seen as good gas mileage as i am now.  My two cents:  the K&N is worth it, not to mention it is cleanable and reusable. 

[Bounty Hunter]

18mpg (gps verified) with:
bias 36" TSL's
5.38 gears
AX5
Mopar stage 2 cam
Airtube and conical K&N
4.0L TB and spacer
electric fan
Firepower iginition system

Nice being able to accelerate uphill in 4th and 5th gears, correct axle gearing makes all the difference in the world.

I've gotten 21+ with 4.10 gears back when I was running 31" and 32" tires.