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Would a fuel additive help if bad gas was put into car?

Yes. If you accidentally add bad gasoline in your car, it will cause the car to drive roughly, if at all. A quality fuel additive can help improve the fuel's octane and prevent rough running, knocking and pinging.

Using a fuel additive can not only reduce the adverse effects of bad gasoline; they also have other benefits. Some additives can clean and help maintain your fuel system, including your injectors, intake valves and combustion chamber.