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Replace 5 car parts for better gas mileage

Mass air flow sensor
Mass air flow sensor © Winai Tepsuttinun/Shutterstock.com

Function: It measures air flow entering the engine and sends that information to the engine computer, which regulates fuel injection, the ignition system and transmission shifting. When it gets dirty, the information it sends isn't accurate, affecting fuel economy.

DIY difficulty: Easy.

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