sorry doc,,,the more weight the harder the car has to work to turn the wheels, look at it this way,, if you go from a very small tire ,,say on a jeep, the you put a airplane tire ,, you will brake an axle tring to get a burn out. this is why very expensive racing rims weight 10 to 14 lbs and slicks are on the light side also.

1. lighter tire and rim on the rear the better,
2. narrow lightweight with high air pressure on the front.