When I worked at my pop's Sunoco station during college, a man would come in and get $5 and an odd amount of gas every few days. He'd immediately dump the change in the gas tank. That was his down payment on the next car, he said.
We often wondered just how much money was in there and how much it weighed.
Judging that 1500 lbs in the rear of most cars would flatten the tires I would say when the tires are half flat buy a new car!
That is so logical in its act its funny.