Q45tech wrote:Since wind resistance is a cube root factor, the engine is designed to optimize mpg from 50-60 mph.
We will all see this when the 2009 Congress brings back the 55-60 MPH limit with $5 gallon fuel {$150 oil}.
I don't know what good it would do to lower the limit, when they don't seem to be enforcing the one we have anyway. Driving 5 over is slow around here. 10 to 15 over is average, depending on traffic. They would do better to start enforcing the limit we have and save the cost of new signs.