Old Question Asked Yet Again
Ok - we are seeing more folks driving with their rear windows open. Why, please?
Forum Discussion
Johno02 wrote:
Do you get better mileage driving with the tailgate up or down?? Mythbusters tried it, but I don't remember the results.
Many years ago I read there is almost no difference. One study - Motortrend maybe? - found that a small amount of "vacuum" formed behind trucks cabs when the tailgate is down. Actually found there was a miniscule increase in mileage, meaning better mileage, when the tailgate is up. The best they could figure is that the up tailgate directed some air into the "vacuum", breaking it up, and increasing fuel mileage. All numbers, though, were very small - realistically no difference.
I haven't read or seen anything recently.
