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Old 05-02-2000, 03:10 AM
Cowboy Greg Cowboy Greg is offline
Join Date: Jun 1999
Posts: 249
"Ethyl" gasoline corresponded to "premium" gas nowadays. The difference was the addition of tetraethyl lead to the gas, which boosted octane and also protected the engine against wear (the lead plated onto the cylinder walls, and being soft, was easily scraped away by the piston rings. The end result was better compression.) They stopped with the tetraethyl lead when somebody noticed lead was toxic, and maybe it wasn't the greatest idea to spew it out of tailpipes nationwide. Thus, the big move to unleaded in the Seventies.
"Y'know, elf tastes just like chicken!" -- Tom Servo