with a 20oz fuel tank what would you guys think I should get for a flight time with my MVVS 35cc red head gasser ??

with H1R at 32 to 1 I only get about 12,13 minutes, and keep in mind my carb was not pumpping as it should !!

Jim

The engine is quite powerfull, and gasoline is what provides that power. A lot depends on your prop selection and throttle use. Anything between 12 and 15 minutes would be about right. The engine has a fuel consumption of slightly over one oz/minute on a 20x8 prop.