For example - replacing your air filter will help your car run more efficiently. This is true for older vehicles with carbureted engines, but modern, fuel-injected engines have onboard computers that automatically adjust the fuel-air ratio to the proper level.
Changing a dirty air filter will not increase your fuel economy.
Also a myth - It takes more fuel to start a vehicle than it does to let it idle. The truth is idling can use a quarter to a half gallon of fuel per hour, costing you about 1-2 cents per minute. urn off your engine when your vehicle is sitting still.
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