Does having both windows rolled all the way down in a coupe effect the speed?

Question

Would it effect acceleration/top speed? I would think the drag would make it slower..

Answer 1

You are correct. It will increase the drag coefficient and the faster you go, the more the drag. About the only effect you will see would be a little less gas mileage, and I doubt if you'll even see that. So that leaves the wind noise as the biggest thing you'll notice. good luck.

Answer 2

TOP SPEED WOULD BE AFFECTED GETTING THERE TO A LESSER DEGREE BUT TOWARDS THE TOP MORE-SO.
BUT ONLY BY A TINY AMOUNT
CLOSE EM AND SWITCH ON THE A/C OOPS THAT USES HORSEPOWER TOO!