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Fuel consumption of a car will generally increase with age.

In other words, MPG will go down.

How much depends on how well the engine and other drivetrain components are maintained.

Many different parts can wear out and reduce efficiency.

Some are inexpensive and easy to replace, like spark plugs, sensors and thermostats.

Major mechanical parts like rings and valve seats that can reduce compression are much more expensive to replace or repair.

So it makes more economic sense to live with their gradual degradation.

IN most cases that MPG will decrease so slowly that you probably cannot tell the difference. A well maintained motor will get the same mileage consistently. Some cars actually improve with age. My wife's Honda Civic went from 30 mpg to 38 mpg over a three year span. Plus we changed to Synthetic Oil and Transmission Fluid/

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Q: Does age of car increase fuel consumption?
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