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I average about 26-28mpg on my JDM ITR engine...I actually noticed my mileage go down on average 1-2mpg when I put my stock wheels back on (going from 31lbs per corner up to ~37lbs per corner) for the winter.
I usually get 250-290 per fill, really depending on amounts of city and highway driving.
One time when driving back from Toronto to Philly I got a solid 37mpg...100% highway, and what was with my GF and our two luggages in the car. w00t