Steigler doesn't make a distinction between them and you seem to be missing the point. He didn't use either for anymore than a minute or ninety seconds. If this is implemented ingame with 10 mins usage permitted and yet another 10mins after 5 mins cooling of the engine as some seem to be hoping for, then TD may as well not bother doing it as it'll be just as historically inaccurate, usage wise, as what we have now. I hope there are penalities for it's overuse, together with heavy vibration modelled in cockpit view when used, (Spitfires as well, from the BOB era, shook like crazy when the throttle was pushed through the gate
. Barely functioning engine sounding like bag of spanners after more than 5 mins usage with random engine failure as well would be good IMHO, and I'm a 109 flyer.