How does driving with windows rolled down affect my gas mileage?

Question

Say I got my windows rolled down all way while doing 55mph with my A/C shut off. How does the gushing wind affect my miles per gallon?

Answer 1

I believe this was on mythbusters--i think... they proved that over 60 MPH its more economical to run the A/C than to have all 4 windows down...below 60 and the windows were more efficient. I like having my windows down anyway.

Answer 2

Driving with the Windows down at high speeds cause more drag on the car.The more resistance the car has the less gas mileage it gets. However, the difference in miles per gallon is not great.

Gas mileage is also reduced by under inflated tires or carrying heavy loads in the trunk all the time.

Answer 3

i own a shop,and it creates a drag on the car the air entering the car would be going over it or around it if the windows was up,so this creates a slight drag on it,same thing with the tail gate up on a truck it also creates a drag,i never drive with mine up unless i haul something,but having a window down will affect the gas mileage on any vehicle,good luck i hope this helps.

Answer 4

Depending on your car's make and model, driving with the windows rolled down instead of running the air conditioning may cause increased drag, and therefore be less efficient than running the air conditioning with the windows up.

Answer 5

Not enough to get excited over.

Answer 6

tryina gatch me ridin dirty