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Welcome! A vehicle that can accelerate from 50-80 in a couple seconds (beats ferrari's by the numbers) and get 30+ mpg is impressive indeed!
I am not trying to be derogatory, but this reminds me of the gadgetman groove. I too cobbled my first vehicle together (78 chevy truck, 350 block, 383 crank, aftermarket heads, hooker longtubes, Holly 650cfm 4 barrel, goes on and on) and had similar experiences in power though idle, FE and drivability suffered.
It seems short of intentionally tuning the engine to run lean, there is no magic combo for MPG and power, it's all one big compromise. Turbo's are sort of there through tuning, but one romp into boost will kill any fuel economy of a conservative tune when not in boost.
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