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Make sure the vehicle is tuned correctly and tires are inflated according to the sticker in the drivers door. You can also install a cold air intake. It replaces the factor air filter assembly. Most new after market air filters are washable when dirty and never need replacing! The factory system is designed to be quiet and not always efficient. You can also install headers replacing your factory manifolds which are the cheapest way for the manufactures to build parts. Then install a cat Back exhaust system replacing your factory exhaust system. You can go up an eighth to half inch diameter on the exhaust pipe and go with a performance muffler. They have performance mufflers that are as quiet as a stock system or as loud as you want.

A cold air intake and cat back exhaust is a very popular upgrade these days, it allows your engine to breath better and you will get increased efficiency of your vehicle with an increase in set of the pants power as well as increase in fuel mileage of 1-3 miles per gallon.

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Q: How do you increase car motor efficiency without accessive petrol?
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