Quote:
Originally Posted by stefanv
I tried this for the next few days, and it doesn't seem to have had any measurable effect on fuel economy (my driving is mostly ~90km/h on country highways)
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Your moderate speeds (= 55 mph limit for our American friends) lessens the impact too.
FYI, completely anecdotal, but in the same hot weather you're probably talking about, I did a trip at 80 km/h = 50 mph with both windows wide open, and then the same trip with both nearly closed. Same MPG on both trips.
Doesn't prove anything, of course.
I also tested it directly (repeated coastdown testing), and could detect the extra drag of one window down in more controlled conditions.