You guys are gonna hate me, but I like the present fuel multiplier. And I have flown the Lavochkin almost exclusively, since I first started AH.
My squadron has found that raids of up to two airfields away are possible, which is about 80 miles, 160 miles roundtrip. Of course, we throttle down a lot, but only after attaining 20k, using up a 1/4 tank. From that point we throttle down until contact is made. Of course, our combat window gets quite small when we patrol two airfields away, but we do some planning, and pick the 'quiet' sectors for that (makes for lazy targets and quick kills).
In combat, an overriding concern is remaining fuel, and so we know how much fuel we need to get home. When it gets to that minimum amount it's 'rtb' time. Granted, someone on your six might delay that, but then OTOH our method of combat is determined by our fuel status. So, on long raids we keep energy and break against superior bandits, resulting in fewer disadvantageous situations.
Of course, the long-ranged fighters have the advantage of being able to rack up more kills per sortie, but in terms of getting altitude, I disagree. We fly at 25k on those deep raids of ours, long before we meet up with anyone. That's about our ceiling for effective fighting, and if it wasn't we'd be higher. We certainly have shorter windows of combat, but nothing as bad as being unable to get to our 'perch'.
This is an ahistorical arena, I understand that. And because it is ahistorical, there may be an argument for increasing aircraft range, but I prefer it this way, because it keeps me honest. Worrying about fuel has made me a better pilot, curbing classic online flightsim suicidal tendencies(COFST).
AH is just starting out with many issues to be addressed before it is finished, but I'm hoping that the scaling of fuel to the arena size is a sign that we will, indeed, see historical arenas with historical matchups. Why else would you impose such realistic concerns unless it was to prepare us for such an arena?
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129 IAP VVS RKKA