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We pretty much use the Econ mode all the time. From what I understand it changes the shift points slightly to get into 6th gear faster, and then holds in 6th gear a little longer on the hills.
Our fuel mileage is probably best at 55 mph but it seems like it takes forever to get anywhere. We target 60 - 62 mph on the interstate as a good mix of speed and economy. That speed also allows faster moving traffic to move around us and keep pulling away, maintaining a safety cushion ahead. "Experts" say to keep back 4 to 6 seconds from the vehicle ahead for adequate reaction and stopping time.
Cruise control is nice, but I can get better mileage if I control the throttle manually, especially in hilly terrain. On small hills (where I can see the bottom), I let the speed build going downhill and add throttle well before the bottom, then use the inertia to get up the next hill, sometimes without downshifting. It drives our friends crazy because our speed isn't constant and we're like the ol' dragonfly truck driver (we drag up the hills and fly down the other side). For that reason I prefer to let them lead and I bring up the rear.
If you get the chance while you're in Florida, stay at Lazy Days in Seffner (Tampa). They offer a free RV driving class to customers staying at their Rally Park. Class is 2-3 hours of classroom in the morning and actual driving in the afternoon. It's well worth the time. Spouses also.
Hope this helps!
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Denny, Connie & Shadow (former barn cat made good)
2006 Tiffin Phaeton, Cat C7, Freightliner Chassis
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Linear Mode
