Just to try and keep the ball rolling (with myself cough cough)...
My partner and I have tested on a couple different surfaces. These floors each have different types of flooring (ex: linoleum, a waxed gym floor). that hasn't really caused us any issues. However, the slope/tilt of floors have caused our vehicle to sometimes veer off to the side. For example, if a floor is slightly tilted to the right, the car follows in that direction. Our distance covered is relatively consistent, however, the tilt of the new flooring we tested on today resulted in our car veering off to the side (missing bonus). Is there any good way to account for this?