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Ok, to echo what kir_kenix said, they seem to be great in the lawn equipment. I have converted to them in all my mowers, weedwacker, chainsaws, etc... For a car, save your $5.99 per plug and get the standard plugs for your car. Do some research on the web, you will find independent test folks have done, where they saw little to no increase in mpg to those that saw a decrease in mpg in the autos.
BUT I have seen a lot of positive in lawn equipment, even small engine and motorcycle repairmen that keep the 'bad gas' that they drain from motorcycles that have set up all winter, and wont run on that gas, and they can burn it in the mowers with the e3 plugs. I have tested this theory, with a can of old gas found in my Dad's shop. His mower would not crank, with the bad gas and a standard (Brand NEW) copper plug, but fired up and ran with the e3.
Hope this helps.
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