I would be careful on basing bonus or penalty points on fuel. This would tend to favour/penalize the allied a/c - which tend to have more fuel.
Realistically - I am not sure why the a/c have different fuel levels - sure there fuel tanks were different - but who knows at what point the encounter occurs. It is possible that german a/c would meet allied a/c and have the fuel advantage - especially as the allied patrols became more aggressive.
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