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I recently got 29-30 on a thousand mile RT to Florida. Around town I am getting 18-19. The FL trip was mostly interstate @ 70-79 MPH. Great for a car this size and wt.
I get 24 driving to work, my '95 Corvette achieved 21 on the same drive and considering they are both dead even in a drag race (but the LS is infinitely more comfortable), I'm happy!
As slow as the C4 Corvette is, it's still quite a bit faster than a LS460. We are talking about a low 14/high 13 second car versus a mid 15 second luxury barge. You should definitely find out what's wrong with your Corvette.