Thread: How to compensate my MPG calculation for "taller" tires?
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Old 06-17-2008, 08:32 PM
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Post RPMs
Well the Fit Tachometer is not very precise, but I can tell you this.

With the original tires, at 69 mph my tachometer was just under 3400 (v-tech kick-in) at about 3380 rpms or so.

Now with the new tires when the GPS says 69 mph, the tachometer is between 3100-3200 rpms.

That is a nice drop that (I assume) reduces fuel consumption and it does quiet the engine a bit.
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2009 Taffeta White Sport m/t
2007 Vivid Blue Pearl Sport m/t
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