I just got my custom tunes, took it out for a 250 mile drive this weekend. I don't have a gps, but using the mile markers on the freeway, my odometer flips about 150 feet before each mile marker. I also feel "slow" driving the same roads I'm used to. Decrease tire size a little? I have 285/75/16 Terra Grapplers, max psi 65, and running them about 43. Is this too low?
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