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Just filled up and wanted to post results for anyone searching for B381 tires... I have many things I want to do to this car, so these are definitely Not scientific numbers(I basically make a couple changes, hoping for a high score- then will backtrack to eliminate variables if I feel like it). Anyhoo, in the 9 tank fills before these tires, 37.24 mpg was the best and in the 4 tank fills since installing the tires 37.83 mpg was the worst, with 40.77 mpg being the best.
Since I don't know the rolling resistance of the worn out stock Yokohamas that were replaced, and since i had to buy size 185/65/r14 instead of stock 185/60/r14.... I dunno how much these tires helped/hurt my mpg- Although these do glide a lot easier....
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