But Hollywood misses a LOT of technical details, and a big one ruins the major premise of this episode - that the limited amount of gasoline available can either be used by Colonel Gallagher's bombers, or by his brother's (Jack Lord) ground troops for their trucks and tanks. WWII aircraft could NOT use the same gasoline as WWII trucks and tanks!!
WWII ground vehicles were designed with low-compression engines because gasoline you were likely to find in Europe & North Africa was low octane & poor quality, but army trucks & tanks could run just fine on it. If you absolutely had to, you could drive a few miles using aviation gasoline if you took it easy on the throttle, but the engine would overheat, blow spark plugs and burn valves before long. On the flip-side, WWII aircraft engines would be down on power so much and would "knock" so bad on the low octane gasoline for trucks & tanks that the planes wouldn't even make it to the end of a runway - it'd be like trying to race a NASCAR car on gasoline for your lawnmower!
The show's writers and producers either didn't know that (probably didn't) or figured the public didn't know, but especially in the 1960's when the show was produced, I'd say most people did know - I sure did & I was only 12 years old when this episode aired! Knowing that "little detail", what happens in this episode couldn't possibly have happened (airplanes using gasoline for trucks & tanks), but if you can overlook that, the show has the heroic action you expect from "12 O'Clock High".