When Smokey Yunick wrote about his Adiabatic engine in the old Car and Driver magazine, he was using the Chrysler 2.2 turbo engine with high compression and an intake that had a carburetor upstream of the turbo. With the high heat transfer he had a fully vaporized fuel mixture and would run very lean. Blew up lots of engines.
In the article Smokey also said the key to better economy was high throttle openings and engine loading.
In the carburetor, the accelerator pump squirted in extra fuel to compensate for the lean mixture that would result from just opening the butterfly. Then, as the air velocity increases, the vacuum would draw fuel. Anyway, the idea was to have tall gears and large throttle openings as a matter of driving protocol to save fuel. I can see how it worked back in the day of carburetors.
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