Just like a car it really depends on how you drive. Sea-doo claims the 900 h.o. model will use 2.4 gallons per hour ( 1.9 non h.o.). Anyways I own the h.o. model and I would say I burn 2.5 gallons per hour. However my girlfriend who rides less aggressive (pretty slow actually ha ha) uses at most 2 gallons per hour. Pretty awesome considering some of my friends who have 260hp and 215hp supercharged skis use 10++ gallons per hour . SERIOUSLY. I guess that's why they put 20 gallon tanks on those things and only 7 gallon on the spark.