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Originally Posted by sarguy01
So, I may be going with new LRR 215/65/R17's. They are 28" tall and 1.1" narrower then my stock tires. My stock tires are 29.1 inches tall.
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That's a 3.5% difference, which is quite large - large enough to give a warning in 1010Tires' Tire size calculator.
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I am guessing that the increased mpg from narrower and 9 lbs lighter a piece tires savings will overcome the decrease in MPG from higher RPM's.
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You'll have 2 effects fighting the third - all of these only have a relatively small impact, so how it'll turn out is anyone's guess.