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I think you might make it by using mpge rather than mpg. Yep, put an electric drivetrain in it and triple the efficiency. Then you could use the vintage format but do a retro version that decreases the drag to no more than 0.24. You implied you could go with a single-seater so it doesn't appear you are worried about the size. That means you have the capability of keeping the frontal area very low. If you insist on carbon fuels I would go with a diesel engine where legal and use a form factor like Dave Cloud's Dolphin.
JJ
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