I gotta agree with ALf here....WHAT does amount gas available have to do with how many gallons ya can put in plane?...if plane can only get 100 gallons due to a supply issue...then what ya are lookin for is plane with best miles per GALLON (or liter...for yall dopesmoking-maggotinfested-pinko-commie-libs) at any rate..the fact that a P38 flies forever on 25% and a spit or 109 goes about 5 min on 25% is ONLY because of the teeny tank...if ya put same amount of gas in each plane...they would stay aloft similar times. ..unless I was drivin the 38....would get kilt of course.