Hello, As a first timer and non mechanical person, I'm open to suggestions. I have a Damon Intruder, 36 ft. Workhorse chassis, 8.1L engine, 345 HP, Allison transmission. I generally leave it in overdrive mode all the time. Is this a good idea or should I shut off the OD when in city traffic. When in OD it shifts into high gear at around 55 MPH and downshifts at around 50 MPH. The longest trip so far (I've only had it for 2 weeks) was around 350 miles in hilly but not mountainous terrain (not loaded and no tow vehicle) and I got 7 mpg exactly.
Thanks for any suggestions.
