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I got a little scared so I took Highway 20 instead, I'm more familiar with it and my sister was in the car with me so I didn't want to freak her out. I averaged about 40 MPG over 8 gallons, not bad but I was hoping more considering I pumped up the tires 20 PSI above door specs. I'm going to do one or two tanks of city driving with my tires this high just to see if it helps city MPG any. If it's not worth it I'm going to go back down to 32ish, center tread is bulging out noticeably and that's going to wear it hella fast.
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