Well one advantage you have is you have 12mm studs. but for those that have pre 95 cars we have to make adapters to put on the Acura or Nissan rims. Thats my washer bending trick. you shouldn't just say you would never tow like your a autority on the matter it messes with people later that might need to or want to tow. just because you don't want doesn't mean you cant. lets not forget the car is rated for 100lbs of tongue weight and 1000lb trailer.
What you may not be understanding is that the car tows a trailer that weighs much more very well. But when your flat towing a car with a tow bar the towed car has a bit of a push in a tight sharp turn that is created by the towing cars ass end swinging and the towed car still being in a straight line. until the wheel is forced in the towed car to turn it can cause the rear tires of the towing car to slide if the towing cars is not heavy enough. For this reason the standard is to have the towing car be 600lbs heavier than the towed car. This is to add a bit more friction to the ground so the car can not be pushed around but it does not cure the problem. trailers do not have this as you are pulling the tongue around and that is the steering wheel for the trailer. on the towed car you pull on the front of the car until the wheel decide to be forced into the turn.
The cure is stiffer suspension and better tires having the tow bar at the correct angle of level.
i did not say i drive around with no tire pressure i run 50 psi myself i said the tires are rated for 100mph at 0 pressure and that you can not tell on these tires if they actually have air in them or not in the Geo as the car is so light and it hasn't enough power to really work them like a rally car would.
Looks like were doing about the same thing your just doing it in a 95 or newer model. Ive never had much luck getting the really good gas mileage out of the post 94 models what are you getting for a average. here is a video of the tires on the car and my balls hanging out in the breeze. I'll have to shoot some of the spacer washers i make for the rims.