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Old 01-11-2016, 08:35 AM   #6
Senior Member
Join Date: Jun 2012
Location: Spotsylvania
Posts: 376

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
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