Quote:
Originally Posted by bl52krz
Tyres Do definitely make a difference. My son lives in Germany. Round trip around 1100 miles. With Goodyear Efficentgrip 195/65/15, 52/53 mpg. With Avon Z5 215/55/16, 48 mpg. Says it all really.
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Yep, the Avon's have more rubber on the road and thus more resistance plus a 16" wheel takes more power to move but that should be balanced out by a bigger wheel being more efficient once in a steady motion....
A left field guess might be the amount of cords/silicon/rubber mix a tyre has?
Kev