Yeah, it burns some fuel for sure. Went with over a half tank and thought it would be enough. Oh and this 12.5:1 compression motor runs on 98 octane with no sign of detonation. Timing was left at 36*. I had penty of engine builders telling me it needs 110 all the time. Don't let anyone fool you, IMO 110 isn't needed with 12.5:1 in a 511 with under 7000rpm usage. I think there are many racers out there leaving power on the table by over octaning. I may get away with 96 octane. I'll let ya know.