Originally posted by Benny Moore
Spitfire had 85 gallons. Me-109 had 105 gallons. I believe all production models during the war had the same amounts. For comparison, P-38G had 300 and P-38L had 420. Numbers are not exact.
109 tank carried 400l, about 88 impgallons.
And you are mixing up us gallons with imperial gallons, they are not the same.
Us gallon: 3.785411784 litres
Imp gallon: 4.54609 litres
To make it easier, in litres:
Spit (85 impgal): 386l
109: 400l
P-38G (300 usgal) 1135l
P-38L (420 usgal) 1589l
It's worth to mention that the P-38, as a two engine fighter,
needed more fuel, and also the Allison had worse consumption figures than the DB601/5, so the difference in time of flight in internal fuel between a P38G and a 109 is not that big as one might expect.
To put it in numbers, in climb power, the 38G could go for about 107 minutes, and 64 minutes for a 109F-4. Still a big difference though.
Edit: those of course are hypothetical figures, engines couldn't run that longer in climb power without risking failure