Would changing the tyre spec of a car change the mpg?

Would changing the tyre spec of a car change the mpg? If so, by how much? The Ines we are looking at come with an 18-inch alloy and we are looking at the 17-inch optional extra for comfort. Also would including a spare wheel alter the mpg or would that already been taken into account by the manufacturer?

Asked on 3 July 2017 by Clare

Answered by Honest John

The deeper profile narrower 17-inch tyres will normally improve fuel economy and CO2 a little bit. Maybe 1.2 mpg, 1.2 g/km CO2. Adding a spare adds weight and increases fuel consumption a tiny bit, so small you won't notice.

Tags: fuel economy ride comfort wheels and tyres spare wheel mpg consumer advice

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