Saving gas by not changing lanes?

[aalb1]

Describe your drive a little more... As of now I'm thinking that the 2mpg is more a result of other things rather than less PS use. Aren't you surprised that you gained 2mpg from less PS use?

I'm thinking this.... Changing lanes means you need to pass someone. Passing usually results in faster speeds and more acceleration periods. Staying in one lane means that you'll stick to a fairly constant speed, and usually a slower speed and in return less aero drag.

See what I'm getting at?