The heavier wheels would slow acceleration a bit but constant state should be better.

When doing it with tires, though, with the error in the speedometer, it will appear that mileage is less, but after correction it will be more.

Tom W

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.