People used to steal what they thought was gas from the farm. They would pull in when nobody was home or in the middle of the night and fill their car up. They would get about a mile and it would stall. Most of them got caught because they had to walk back and call a tow truck.
Of course that was straight diesel in their tank and it fouled the plugs. I usually mix a gallon or two into a 16 gallon tank. No problems.