TigerXJ

Here is my XJ.

1999, stock 4.0, AW4, np231 with SYE. 5" lift, 15x8 steelies, 33"x12.5" TrXus MTs. Jcr rock sliders, rigid front and rear bumpers. Stock D30/8.25. 3.55 gears

When it was completely stock, I eeked out 20mpg a few times. In its current state, I've never really paid attention, but usually around 10-13mpg. One time towing a trailer when moving, we got 8mpg (all calculated via GPS because my odometer is off).

Last night we were traveling to my in-laws. Filled up at a shell station at exit 27 on I-85, then drove 69 miles to exit 96 on I-85 (all in sc). Then stopped at that exit and topped off. Filled to the brim with 4.05 gallons.

69 miles/4 gallons = 17.25mpg.

This was at about 60-70 mph the whole way. Loaded with myself, wife, 5month old son, dog, a weeks worth of clothes for everyone, a bunch of guns and food, and all the Christmas gifts. So it wasn't like we were especially light.

Has anyone else gotten mileage like this on stock drivetrain and 33s? Is my math wrong? Am I an idiot?

Xj88

I get 18 in mine on 32s and stock gears.
Only mods is a 3" lift, k&n intake.

Bustedback

Down hill with a tailwind?

TigerXJ

Uphill with crosswind! Went from the foothills of upstate sc to kings mountain area in NC

letsgomuddin

Must be gremlins!

nickxj94

My 2000 gets 17.5 on 31s and stock gears 3 inch lift that's running 65mph on i40 to little rock. Two weeks ago

Rock Toy

69 miles isn't enough to check mileage on. The difference of one gallon or even a half of a gallon on the fill up makes a huge difference.

salad

Yup. The amount of difference between when that pump shut off versus others is enough to make it seem that high on such a small amount of fuel.

2008infantry

IDK how you guys are getting these numbers...... I have a 1999, 4.0 I6 stock gears, 3.5inch lift, 31's and I swear last time i check it via math and 2 tank fulls of gas I got like 8-9 MPG.

salad

Because your Jeep isn't normal running condition

Pnguyen7

Check your o2 sensors...

Big David

• I have 33's, stock gears,stock speedo gear & get 15 MPG, uncorrected. 17 MPG corrected.

jeffro9944

U must have filled up with V-Power, ha ha

TigerXJ

Both times filling up I pumped it a few times after it shut off, to the point I was getting a little backflow up the filler neck. Seemed pretty full and pretty reproducible to me. Anyways, I know my jeep doesn't get 17.25mpg all the time or even over an entire tank, but over that 70 mile stretch it did. Gives me a little hope for interstate travel with it.

Now the stretch from Shelby to Asheville, I bet was closer to 10-12mpg, cus you go from 850' elev to 2700' at my parents house.

ericfx1984

I actually just did a 2 tank average, got about 16.5 mpg, running an average of 2,200 RPM in 3rd gear (automatic) on true 33" tall tires, thinking about running in 2nd gear on the highway... that would be about 3,500 to 4200 rpm