I'm never ever doing level flight with a fun fly. Even with landings, I'll do a roll or three as I come in. I like to do lots of things tht require more than half throttle. I never leave the throttle at one setting very long, going from idle to full throttle and everywhere in between many times every flight. Sometimes I fly gently, but lots of times I do violent things that require major throttle changes.

Full throttle doesn't mean fast unless you leave it at full throttle, or you are going straight! If I never used more than half throttle, I'd be better off dropping to a .32 sized engine and saving weight.

The Ultimate will be heavier and a lot more draggy than the Fazer, so it should use fuel a lot faster.

BTW, four strokes are much more fuel efficient than two strokes, so the YS .53 isn't a good comparison.

Tim