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Yep. I know an old school bus mechanic who had one of his drivers fill the bus with gas once. He went in, siphoned some out, dumped 1 quart of motor oil for every gallon of gas and sent the driver on his way. The old Detroit drank it just fine.

If your 80 gallon tank is full it won't hurt anything. If it only has 5 gallons in it that is another story, top it off with diesel. 5% gasoline won't hurt anything. VW and Mercedes used to even suggest adding up to 20% in cold climates in the 70's and 80's to help starting if you didn't have...