My brother bought a "gas van" at auction 6-7 years ago. It had been a utility company vehicle in NYC, an early 90's Dodge heavy duty van. There was no place locally to fill the tanks, so my brother opened an account with a filling station near the Philly airport, about 25 miles from where we live. The van was near empty, so I followed him on his pilgrammage to fill the tanks. After a few wrong turns we finally located the place. It was Saturday and there was noone there, but the pump was open. We punched in his account number on the keypad, and his pin number. No gas, please re-enter code... So now we're sitting there with a $300 gas van with nearly empty tanks, in an unfriendly neighborhood, and no one to assist with the pump. My hacking skills kick in, we enter 111111 as the account number and 555 as the pin, BINGO! We've got gas! (Yes, he contacted the company and attempted to make restitution. Eventually he gave up when noone seemed to give a crap).
So, back on the road, homeward bound with a tanked up but mildly overheating gas van. (With a left front brake disc that's dragging and making his left foot uncomfortably warm).
We pull the van back into the yard, open the hood and remove the interior engine cowling to let if cool off better, and then we check the tank gauges.
We've used almost exactly half of the tanks load to make the 25 mile trip home.........
Not knocking CNG vehicles, just relating a funny story.