[skyking]

Not much of a problem in my state, as the trucks have a lower speed limit. Hardly anyone else wants to hang out there.
We recently took the 5th wheel and truck on a long trip to the redwoods and wine country in California. One time I let a truck on the freeway and then moved back to the right within a 100 feet or so in moderate traffic.
I had the cruise set and the results were dramatic. The boost was up around 10 PSI with the trailer on, and it dropped like a rock down to 4 PSI! As he kept pulling ahead, I could watch the boost ( and fuel usage ) go up. It was a great little graphic demonstration of the effects, and especially on another large rig like the 5th wheel.