Airlifter...... My '02 DS has the 330 Cat on a FL chassis. When we're moving we are towing our car, so we're moving 35000 Lbs. I don't search for the best economy speed, but rather the speed where the coach seems to run most smoothly, the best apparent balance of HP and torque. I cruise at 1650-1700 rpm, which yields 63-65mph. After adjusting for Gen use, our four-year 25000 mile average fuel economy is 7.4 mpg.
John, Diane, and Lincoln, the guard cat. RVM103
Fulltimers since June 2012
2002 Dutch Star 40, Freightliner, Cat 3126, 2004 Element