Do cars get better gas mileage with clean air filters? gas mileage for 10 cars with dirty air filters and clean air filters was studied. each car was tested with a clean air filter and once with a dirty air filter (with the order of the testing randomized). what type of study is this?

Explanation:

Yes.

Proper maintenance of cars or any vehicle will add more life to it and increase the quality performance.

If dirty filters of cars is changed, the gas mileage will increase resulting into a better performance of cars.

Dirty air filters reduces the capacity for it to filter the air going into engine. If air filters are not changed for a longer time it results into misfire or trouble starting.

prolly a beacuse the momentuem the car has increases while going down hill