The additive may help conserve gasoline, but mechanics say it can wreak havoc on small engines, such as those used in lawn mowers and leaf blowers. Excess heat can cause corrosion in critical parts such as lawn mower carburetors, costing as much as $100 to replace. Many owner manuals, including those of Echo's string trimmer and Toro lawn mowers, advise that gasoline with no more than 10% ethanol are OK.

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