[Southcross]

I wonder how having a single window open would affect FE in regards to cruising "speed", and "vs. running your ventilation fan at full blast"... especially in a car without AC

I would assume that since "drag" increases with speed, below a certain speed the percentage of cD lost (gained? LOL) would have to be substantially less the slower you go. So If your cruising in city at 40mph, you shouldn't get nearly the hit on FE as if your flying down the highway at 75mph with it down... or at least the logic is telling me so LOL

Also, would it be more of a hit to drive with a window rolled down or to have your ventilation fan running full blast (alternator drag). I would think that the opposite of that would be true... bigger hit at slower speeds, less at higher, with the fan on.

Also, I wonder how far down the window rolled down as compared to the hit to FE. cracking both windows, cracking one window... man I wish my car had pop-out windows LOL