Renault Forums :: Independent Renault forum - View Single Post - 17" alloys ruin fuel consumption???

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post #3 of (permalink) Old 28th March 2009
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As Lag says, the diameter of the wheel has nothing to do with fuel economy. However if the overall diameter of the wheel plus the tyre is different from your previous car then it could mean less/more revolutions per distance travelled and could, theoretically, mean the engine is working harder or revving higher to achieve the same speed. On the other hand if the new wheels have wider tyres then there'll be more drag against the road and could lose you a couple of miles per gallon. I wouldn't think it would be more than a couple of percent tho - certainly not 10% or more.
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