Ultragauge fuel economy
#12
#13
My calculated MPG dropped more than 1mpg when I went from tires size 255/65-16 to 255/60-18 tire size. I blame part of the problem from my speedometer and odometer were off a bit (only going 55mph when it indicated 60mph) when I had the OE size in place. With the larger size my speedo is close to right on now, but my highway mileage is around 15-16mpg. I have a hard time to get double digit mpg figures in city driving.
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