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Fitted winter tyres - economy dropped by 3-4mpg

The mpg on Lexus 450h has dropped between 3-4mpg after fitting winter tyres. Lexus dealer says that I am the first person to mention this. Is this normal?

Asked on 17 December 2012 by LJC

Answered by Honest John
MPG also drops in the winter because low ambient temperatures mean longer running on enriched mixture. I reckon on a 10% drop as normal.

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