I recently put Mickey Thompson's on my 90', and at first my fuel consumption was up by 1 L/100Km. But since playing with the pressures to even the wear pattern, and then going the other way for handling (during emergency breaking etc), I have found that I am using less fuel now. If you don't operate at the correct pressure for that particular tyre, on that make/model of vehicle (plus mods), then you are not going to get the best performance.
But in general, wider tyres do require more power to use.
Cheers,
Phill.



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