Quote:
Originally Posted by comptiger5000
How fast are you typically driving when you have the sign up there? If it's not over 35-40mph, the sign itself will make very little difference.
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I respectfully disagree. Everything that I've read (which has been a lot) has provided that speeds as low as 25 mph can effect efficiency.
You're right in thinking that 35-40 mph makes more of a difference than 25 mph, of course. However, it is at this lower speed that we begin to see aerodynamics at play.