I know here is a recent discussion of this topic floating around, but darned if I can find. While waiting for others to respond (I don't belong to any but Passport America by the way) try looking at these older discussions. https://www.google.com/search?ei=EZS....0.VKKlvSXLqBI
Carl (n Susan) Youngren There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB