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well which 8in are you talking about. The rize or cst. i think the rize sites a little bit higher from pics i have seen but you should be able to fit 38s with a 2in As
8 inch rize with 37's i get 10mpg. i will be adding some engine mods soon to help .
maybe if you pulled your foot off the gas a little bit you would get better... i get 14mpg... although most of my driving is highway you shouldnt get that bad of mileage....