I can't see why it would be thirstier than a similar size & power straight 4.
When I changed from the RF900R to ST1300 I found that at the same speeds I used less fuel - probably the newer tech with EFI compared to the older carburettor engine.
Still, going to a bike with over 300cc more engine and over 120kg more weight, I was a little surprised to find it more fuel efficient.
Maybe someone with a VFR800 could pitch in here and let us know how they find it on fuel economy.
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