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I thought it might be nice to have a place where prospective buyers could gather information that they might find helpful when shopping for a new (or new to them) motorhome. What mileage do you get from your DIESEL motorhome? What engine do you have? What is your RV length? What is the weight of your rig? What is your normal cruising speed? Do you tow (weight of toad?) Please, keep advice on driving habits short and to the point (long theses ruin the information readability and is the same as for cars, trucks, etc.) I'll start: We get 6.5 mpg, uphill, downhill, on the flats, towing or not. We have a CAT C7 (no DEF required - 2005). 36' long Itasca Horizon with four slides. At last weigh-in the rig weighed 29,840 lbs. We have, so far, always cruised at the posted speed limit, but not to exceed 65 mph because of our Toad's limit. Toad is a 2007 Honda CR-V 2wd which weighs about 3500 lbs. When we had a fifth-wheel, it was hard to find believeable information of fuel "economy" for tow vehicles. And, don't get me started on the gimmicks touted to increase your mileage...

I have a 40 ft 2007 Damon Tuscany with the C7 350 Cat. I think I have enough power on hills, but wondered if one of the new chips may help fuel economy? I drive between 60 and 65MPH and average about 7 MPG. I don't want to risk damage to my rig. This summer we pulled Highway 20 in Washington State pulling a Toyota Avalon on a dolly. The temperature gauge hardly moved. Saw several cars stopped boiled over on that grade. Has anyone tried this with a 350 Cat?