Topic: Gas Mileage Thread

[jfrabat]

I have a 94 and run 31 with 4.10 /my upgrades are cut the airbox with k&N and knew header  and flowmaster 40 series airaid spacer and i still only get 10 mpgs

 what can i do to get my mpgs up ?

Buy a Prius!   

No, just keep your speed down at 55 mph in the highway, be gentle on the throttle when the light goes green, and coast to stops signs and red lights.  I am assuming your jeep is running smoothly and you do all the tune-ups and oil changes in a timely fashion...

[Bill M.]

A prius? hahah.. Jeff Dunham....

[Jesse-James]

A prius? hahah.. Jeff Dunham....

Not just a Prius, a "Blue" Prius..... 

[Compstall]

I just marked my last fuel tank at 24.xx mpg based on the last fill-up.  A couple days ago I finished up my own cold-air kit.  This Jeep is mainly driven to work and back, 4 miles each way.  We'll see how the cold-air kit fares...

[Mozman68]

I've been tracking pretty steadily for 6 months now since my latest upgrades....about 14.7 mpg on average...I'm happy with that all things considered.

[TahoeYJ]

92 with about 45-50K on the clock, 5 spd, 4:88 gears, 4.0 TB, ported intake, K&N w/ airbox restrictor removed, 35"  MT/R's ran at 35 PSI, Magnaflow exhaust, and I might be forgetting something. I average anywhere from 18-20 MPG depending on how I drive. With a light foot I can get at least 19 around town and if I stay at 70 or below highway, I get 19-20   

[FourbangerYJ]

Tranny = AX5
Motor = 2.5L MPFI
Tire size = 37 (32psi)
Gearing = 5.38
Checked my speedo with a GPS it's on the money!
Engine mods = Rockit City intake tube with K/N. 4.0TB non bored intake. Flowmaster 50 series muffler.

My last run I checked my mileage. I got 12.9 MPG. This is doing 65-70 MPH thru some hills and flat HWY. I  real hard when one of the guys running a 4.0 XJ told me I was driving to fast and to keep it under 65MPH!

When I was running 4.88's and 35's I was getting about 10 MPG.

When I bore the intake and add the 62mm TB I will update.

[TahoeYJ]

Tranny = AX5
Motor = 2.5L MPFI
Tire size = 37 (32psi)
Gearing = 5.38
Checked my speedo with a GPS it's on the money!
Engine mods = Rockit City intake tube with K/N. 4.0TB non bored intake. Flowmaster 50 series muffler.

My last run I checked my mileage. I got 12.9 MPG. This is doing 65-70 MPH thru some hills and flat HWY. I  real hard when one of the guys running a 4.0 XJ told me I was driving to fast and to keep it under 65MPH!

When I was running 4.88's and 35's I was getting about 10 MPG.

When I bore the intake and add the 62mm TB I will update.

I always have people telling me there's no need to go above 65 on the highway in a lifted Jeep. I tell them there is, because it's fun  I love being able to jet down the highway at 75-80 passing lifted fullsize trucks and what not, half the time they decide they need to pass me right back, guess they don't expect it from a Jeep 

Mileage goes down at those speeds, but when I want to get somewhere relatively quick I couldn't care less about the few MPG's I lose

[FourbangerYJ]

Mileage goes down at those speeds, but when I want to get somewhere relatively quick I couldn't care less about the few MPG's I lose

That is exactly how I feel. If I was worried about mileage I wouldn't drive a Jeep. Besides I only put between 1-2k miles a year on it. So when I use it it's to go wheeling, and I want to get there fast. With the new gearing it's a real pleasure to drive! No more 3rd gear on the hills.

[TahoeYJ]

That is exactly how I feel. If I was worried about mileage I wouldn't drive a Jeep. Besides I only put between 1-2k miles a year on it. So when I use it it's to go wheeling, and I want to get there fast. With the new gearing it's a real pleasure to drive! No more 3rd gear on the hills.

I have to use 3rd gear when I get into steeper hills at higher elevations, but that's so I can ring it out to 65-70 and maintain speed. I don't mind bringing my 4 popper up to it's limit 

I've made it from my house to South Lake Tahoe in juuuust over 3 hours. Mileage really went down that trip, but again I didn't care 

Anyway, enough mileage thread whoring 

[93yjFirstJeep]

tranny: ax5
motor: 2.5L
Tires: 33x12.50 m/t
gearing: stock (4.11 i think)
no speedo cal yet
completely stock engine

about 14 in my calculations, but prolly a lil more since i don"t have a speedo cal yet

[dexetr30]

I noticed a big drop in m.p.g. in the past month or so. Probably for 2 reasons. 1. I need to replace the o2 sensor after the cat. and 2. I've had it in 4wd way more than usual because of all the ice, snow and general slop we've been getting for almost 4 weeks on a regular basis. I've gone from about 18 m.p.g. to around 15 or so m.p.g. 
I can't wait for the big thaw!

[chardrc]

mialage also drop when its cold.. I lose 5 mpg in the winter in my dd

[Jeffy]

mialage also drop when its cold.. I lose 5 mpg in the winter in my dd

Does your state switch over to a 'Winter Blend'?  If it does, then that's the reason.  Also, during winter, people use their heaters, wipers and lights more often which causes the alternator to charge more.  Although, I doubt that's measurable/

[The_Madness]

I get around 14.4 in the summer time around town, but that drops down to 13.2 in the winter. However, I pull 20-25 on highway trips, and not flat highway - up and down hills at 40-55 mph.

Motor: 2.5 MPI
Engine Mods: Royal Purple Syn Oil, K&N Panel Filter
Tranny: 30RH 3 Speed Automatic
Gears: Stock gearing (3.73s from what I can find)
Tires: 29" Goodyear Wranglers
Weight: 3395 (if I can remember correctly) with hardtop and me in it
Aerodynamics: Like a brick