My friend Pete drives a very nice Jetta 5. 150 k miles meticulously maintained. He always goes to the same fuel station. A couple of weeks ago he bought an 88 Jeep on the cheap. The Jeep needed a new carb, timing chain, and some TLC. Then it ran great. He went to the gas station filled up and drove it home. It drove fine, but when he went back out to start it the next day it wouldn't run. Squirt gas in the carb it runs then dies after killing a zillion mosquitoes. He called me to look at it. I opened up the carb and the "gas" was green. I told him to pour some gas from the carb on the floor and light it on fire. Guess what? No burn, because diesel doesn't burn when you pour it onto concrete and toss a match on it. He was so used to getting diesel he filled his Jeep with 20 gallons of diesel. My theory is he had enough gas in the bottom of the tank, and the vehicle was hot enough that it made the 6 mile trip home. For sale: 20 gallons of Dieseline. Cheap.