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Someone asked earlier what would have happened if the Bf 109F-1 had been available earlier in the Battle of Britain.

But here's a more pertinent question: what if the Luftwaffe recognized the need for longer-range fighter operations and got the Bf 109E-7 with its 300 liter drop tank into service by early July 1940, or had them installed as Rüstsätze by mechanics on the front line on earlier Bf 109E models? With the ability for longer combat operations over the UK, would that have resulted in a lot more Spitfire and Hurricane losses, which would have made the British winning the Battle of Britain a lot more precarious situation?
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