Between a 35 inch tire and a 37 inch tire with 4:88 gears
 

How bad is the gas mileage from a 35 inch tire to a 37 inch tire with 488 gears

I get 14'ish in town and 16'ish on the highway. I have a 2012 Rubi - 3.6 with AT.

Out of curiosity, are you pulling that from the dash readout or manually calculating. I always forget to write down mileage when I fill up so I go by what the dash says...with a 3.6, 4.56s, and 35's I never see above 14.9 unless I go on a long trip (3 hours) and I'll see maybe 15.2. I've been contemplating 37's.

Sorry for the thread jack.

Weight of wheels and tires needs to be taken o to consideration when comparing mirage and such. Rotating mass plays a huge role in it all.

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I'm getting 18 mpg highway on my 37's and 4.88 gears. It's tuned with the Superchips Flashpaq.

I'm getting 12.5 to 13.8 to the mile

worthless thread.

Mine is hand calculated. I don't really make vehicle purchases or modification decisions based on gas mileage. I've had nothing but gas or diesel guzzling hogs for the past 20 years so I just look at it as part of ownership.

I have an '08 JKU (3.8) with 6MT & 4.88 on 35". I get 15MPG average and 17MPG on highway long drives calculated by GasCubby app.