Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum - View Single Post - Lost 8MPG with New Tires!
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Old 09-24-2012, 02:32 PM   #15
iminhell
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I'm going with weight and diameter.

Diameter will alter the calculation for MPG. OP really hasn't said much about the new tires/wheels so I can't offer much in the way of how much error.
Thought I'd made a thread discussing tire diameter errors, but I can't find it.

Rotating weight is always in play, even at sustained speeds. It takes more power to keep it at speed.
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