I sectioned and channeled a 49 Plymouth businessmans coupe and put it on a Nissan pickup truck frame with a 240Z engine and transmission. The weight dropped from 31-3200 to less than 2400 pounds, just about what the original Z car weighed.
With a newer, much more advanced engine and transmission, you should be able to get to 30 MPG but I think 35 will be a stretch un less you stay below 55 MPH, where the aero is not so significant.
regards
mech
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