[ESmooth]

Same for me as Daox. I regularly P&G on the freeway with a 5-7 MPH window, ideally behind a truck to get some drafting effects and not have someone riding my bumper. With a consistent average speed, the cars behind me dont seem to be too affected by my changes as long as they keep a steady speed themselves. When Im behind a truck, people seem to expect slower speeds and maybe some more dramtic speed changes or just go around as soon as they can.

As long as you arent doing big changes in speed, P&G is effective even at highway speeds. Its most effective if you are adding in engine off coasting at lower speeds with little to no traffic.