A relation put some Mickey Thompsons (not sure which ones) on his 80 series and reckons the fuel consumption increased by about 2 l/100kms. He's not happy.
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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.
Going from skinny to fats can increase fuel burn by upto 15% on my defender
. Road tyre to a/t or m/t
In my 2013 d90 my best was 10l/100km. Normal is around the 10.5 ish... Towing increases depending on load. Worst I've gotten was about 18l/100km.