John,
That is what I was thinking also that if the wheel/tire is to close to the body it would disrupt the air flow around the body. I am planning to fully streamline both the front and rear axles and also cover the inside of all wheels with a non-rotating faring. I am planning to shape the body in the shape of a NACA 6000 series symetrical airfoil in the plan view. These shapes are very aerodynamic, with a very long area of laminar flow and exceeding low drag, which I think is going to be very important if I want to go over 200 with 150 hp. Still at least a year away from really starting but I am making some drawing.
Rex