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Welcome Legit,
As you may have noticed, we already found your video and talked about it.
One thing you were wrong on in the video is that Honda has sold numerous cars that legally operate in Lean-Burn mode. I currently have one, a 2001 Civic HX. On this car, the Ultragauge does not properly compute the fuel economy when it is in lean burn mode. I suspect it would be off on your Corvette as well.
I think focusing on some of the hypermiling techniques might get you to your goal. This does nothing to modify your car away from being a performance car, and can basically be turned "on" whenever you want. I used to have a '94 Corvette that I regularly got 29mpg hwy with before I knew anything about hypermiling. With those techniques, I'm sure I could have gotten in the mid/high 30's.
Good luck with your project!
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