Most fuel additives do little to improve the performance of a vehicle, according to How Stuff Works. They cannot make the engine more powerful or improve fuel economy. More »

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The symptoms of bad gas involve a lean misfire, which creates a P0300 code in newer cars, engine detonation and pinging, sputtering and stalling. These occur because the bad gas fails to keep the fuel system clean and in... More »

With the advent of gas-powered engines in 1892, gasoline, once considered a mere byproduct of the crude oil refining process, began its rise to become one of the most used fuels in the world. The United States uses rough... More »

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While octane booster fuel additives can produce measurable gains of octane in gasoline, these gains are unlikely to improve fuel economy, as octane ratings have little influence on fuel consumption. Some cars achieve wor... More »

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Diesel fuel additives are chosen based on the vehicle performance enhancement that the driver desires. Common types of diesel fuel additives include ones that improve fuel stability, fuel handling or engine performance o... More »

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Fuel additives designed to clean fuel injectors, carburetors, ports and intake valves do work, according to RepairPal, particularly if they have polybutene amine, or PBA, as part of their chemical makeup. However, those ... More »

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Old gasoline causes poor performance and can even damage a vehicle's engine. Gas loses volatility over time and can also become tainted when moisture condensation increases its water content. More »

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