The tell tale sign is that German oil consumption closely mirrored their production. They didn't manage to maintain meaningful reserves post Barbarossa.
They used what they had, which meant that it had to be divided between the various services.
Here's the USSBS's chart for what the Americans call 'aviation gasoline', which follows the same pattern.
From Barbarossa onwards the Luftwaffe NEVER had enough aviation fuel. The Luftwaffe command that suffered the most severe rationing was Training Command which had catastrophic consequences in 1943/44.
Cheers
Steve
With US daylight bombing losses extremely high on oil targets, could more night bombing have been performed on oil targets?