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I have been running 295/30/18 street tires for about a year. Had 285/35/18 before. I don’t really notice any difference in either acceleration in gear or highway rpm, but there is some because GPS shows my highway speed as a maybe 5 mph lower than the speedometer when going about 80. I’d have to pay closer attention to give the exact difference but you can estimate it with a hearing calculator like the one in the technical section of diffs online dot com. Just plug in your tire size and 6th gear ratio.
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