Those old sleds were 2 strokes.

There have been tests done on non-Flex Fuel vehicles to see if they can withstand the corrosive nature of E85 ethanol. Ron *@%^$*@%^$*@%^$en, President of *@%^$*@%^$*@%^$en Inc., an Ethanol plant design build firm in Grante Fall Minnesota, ran a non-Flex Fuel 2000 Chevy Tahoe 105,496 miles almost exclusively on E85. He donated the Tahoe to the Lake Area Technical Institute where it was dismantled and studied. They found that there were no adverse effects of E85 ethanol on the engine or the fuel system. In fact, they reported that the engine and fuel system were in better shape than some vehicles that ran gasoline with fewer miles. This video can be seen and verified at http://www.youtube.com/watch?v=HuOs1yap8mU
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