I too prefer to keep up with traffic. However, I fear that the truck's optimum cruising speed is 65mph. The highways around here have a 70mph speed limit, and most traffic moves at 75 (semi-trucks included). I prefer to plug along at 70-73, unless I am contributing to a slow down, then I will pick up the pace until I can find some clear road again and no one needs to get around me.
I began this research because I had read on some of the trucking forums that the Series 60 programming may be able to be altered to shift the engine's optimum cruising speed a bit, while retaining or even improving fuel economy.
As soon as duck season is over, I plan to head South for a few days. Along the way, I hope to take a closer look at the fuel economy and establish some mpg numbers at various cruising speeds.
2006 Renegade/Freightliner Coronado 43', Detroit, twin screw, 12spd
2001 Ford Excursion PSD
2017 Ford F450