on average one bike has used between 2 & a half & 4 & a half litres per race depending on track size (or each one of ours has).
Of 8 rounds, 6 were 2 round races & 2 were single races (assen & donny) average this to 3.25 per race and dont allow for practice/qualifying, then you could use approx 45.5 litres (or approx 10 gallons??) in the season per bike but we always use more than this as we take 2 x 20 litre jerry cans and use most of it for each meeting but that is for 2 bikes.We need a 3rd can if doing a TD the day before. Add qualifying and also possibly the odd trackday before a meeting and the usage goes right up. For example a trackday at Donnington for one bike just before the meeting used about 10 litres.
Cost a lot more in the summer as prices are down by about 10p a litre now.
After picking myself off the floor from reading Age's numbers...
I'd concur with AK's figures. Except I burned near on 20 litres at a dry Donny trackday last year! The only track I've measured consumption was Brands. That's probably the most fuel friendly circuit we've done, and it came out as 32mpg. The norm for me is to take a 20l can full - approx half goes in the bike and the rest goes in the car (when I used the car for race transport).
Mood: #65 Double Desmo Due Champion - Class B 2007, Class A 2009
I came home with a full jerry can of fuel from Cadders last weekend as my bike only used one 3/4 tank of fuel in qualifying, couple laps of first race and full second race. Mind you, the fuel tank is empty now!!!