yeah tilt. That is the problem. Personally, at least for the ct, I believe gallons should be the determinate. e.g. we can only give each aircraft 100 gallons, you figure out the best way to use it. Otherwise it is arbitrary and just a little odd.
IF you up with a p51 with 50 gallons of gas, well, your the fool. Maybe a hurri 1 would be better.