YEs 50 and 25 would be a real issue. Luckily, htc is limiting porkage.
If the allied plane chooses not to be bloated, it will be running out of gas just as quick as the luftwaffe.
If I up close, lets say a sector out, with 100 gallons in a mustang, I am going to have to ration my gas just like a 109 would. If I up a couple bases back, I will not have to ration my gas so much, will be able to run full tilt mil. But... that is the advantage of having a plane with a big tank.
I dont see how the historical construction of these planes is somehow supposed to be 'altered' for you. You like planes that have small tanks. I like them too, but I dont try to use them when I know they dont have the legs, and if I do, I guess I will be very careful with my cruise.
Straffo's point is a good one, but as I said porkage is limited now.