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the way to tell what will happen is really simple.
using a scangauge......
run mpg test at 45,50,55,60,65. (atleast 5 miles)
record the mpg, mph and rpm. record when the trany shifts.
taller tires will lower the rpm.
so what happens at say 60 on the stock tires will happen at 55 on taller tires. (you will be going 60, but the rpms will be in the same range as the 55mph on the stock tires.)
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