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You know how much the average small-engine repair costs? I don't either, but it's a lot! And a huge source of revenue for small-engine repair shops is fixes to engines that were operated with old gas. Modern gas formulations just don't last as long as earlier ones did. And when gas starts to break down, it not only makes the engine hard to start but also gunks up the whole system with gum and varnish. So if you have a boat, or keep gas onhand to run small engines such as lawn mowers, power washers and chain saws, treat the gas with a stabilizer right after you buy it. That'll save you big money on repair bills later.