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A vehicle demonstrates its best efficiency and engine performance when it is new. As the engine ages, its performance suffers from gasoline fuel-generated deposits that form on the fuel injectors (for injected vehicles), intake valves and combustion chamber. Additives are required to control deposit formation.

Today's fuels, however, lack sufficient treatments of either enough additives or high quality additives. Fuel system deposits result in the following:

• Lost fuel economy
• Lost power and poor throttle response
• Failed emission tests
• Poor drivability - surging, hesitation, stalling, rough idle
• Engine knocking (pinging) and rap
• Difficult starts

In addition to replacing your fuel filter, you need to treat your fuel with AMSOIL P.i. Performance Improver Gasoline Additive.
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Q: 92 Geo Metro Convertible issue bad gas mileage 32-36 was 40-42 hesitation under load ie 1st 2nd gear up hill did all standard tuneup air filter plugs wires cap PCV valve timing what else is there EGR?
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