Does gas mileage really get better on a new car the longer you drive it?

In general, no, gas mileage does not get better on a new car the longer you drive it. Once a vehicle has been broken in, which typically happens within the first few thousand miles, its fuel efficiency should remain relatively constant. However, there are a few factors that can affect a car's gas mileage over time, such as:

* Tire pressure: If your tires are underinflated, it can reduce your gas mileage by up to 3%.

* Air filter: A dirty air filter can restrict airflow to the engine, which can also reduce gas mileage.

* Spark plugs: Worn-out spark plugs can cause your engine to misfire, which can waste gas.

* Oxygen sensor: A faulty oxygen sensor can cause the engine to run rich, which can also reduce gas mileage.

If you are noticing a significant decrease in your car's gas mileage, it is important to have it checked by a qualified mechanic to rule out any underlying issues.