bfschor

I don't know how much weight plays that big of a factor, but I haven't had a rear seat since the day I bought it and I still have my factory bumpers. The AEV wheel and the Duratrac tires are about the lightest aftermarket tire and wheel combos you can get.
I'm almost never driving in the city....1 mile from my house I'm on the highway running 70-75mph and not stopping until I get to work....50 miles later.
When I switched from my factory Rubi tires (what, 32's?) and went to 35's, my RPM's decreased by 200, which helped a little. I'm now at 2200 rpm's at 65 mph.

jkjurny

3 inch lift with 35" Nitto Trail Grapplers. I can get 18 mPG if I go 55MPH. I actually get 14 since I usually go 75MPH.

Delux2769

2008 JKU 3" of lift, 285/70/17 BFG A/T KO E-Rated tires:

3.21 gears, 6-speed manual, half doors, rear tonneau cover, hardly ever go over 65mph

City 15-17

Highway 15 (going into wind) - 23 (with wind)



up to 27 (drafting behind semi)



Snorkel, Dynomax exhaust muffler, K&N air filter

tyler1921

2.5 lift, 35's GY MTR

Avg 17mpg combined
Actual mileage
2011 auto 373's

JKphotoshoot

From the postings here it defiantly looks like the 12's and newer get better mileage.
I run 37 mud grapplers with 5:38 gears and a Hypertech programmer and get 13-14 around town and 16 on my road trips. Squeezed 17 mpg out of on one road trip.
Overall happy with it for a big ole lifted rig.

SBEII

I'm sure that extra gear in the auto helps.

BADDANDY

2013 2 door Sport, 6 speed w/3.73s, 35 DTs, 3.5 lift, stock bumpers and flares, no winch. Consistently gets 20 mpg mixed driving solo driver, no cargo, hard or softtop, up or down.

ptarnuzzer

Even with the AEV ProCal to correct the speedometer, my dash MPG is always higher than the hand calculated mileage. My dash shoes an average of 21.5 mpg, but my true average as calculated by Fuelly is 20.1 mpg.

Matthewd5

While we're talking about mpg, how much is my speedometer/odometer off with my upgrade to 285/70/17's

And if/when I upgrade to like 315's?

I have a manual so I've avoided buying a chip reprogrammer as I don't see how it could help with a stick shift, other than resizing what size tires I have

Matthew

Delux2769

My speedo is off ~1mpg at 65mph with 285/70/17, when stock on was 255/70/17.

Procal is not super beneficial for us Manuals, but the I have several buds that have bought different chips with their manuals and feel a difference. Especially the hypertech and others like it.