I'll pull this thread back on topic from the never-ending oil debate....
Finishing a round trip from Chapel Hill to Northern Wisconsin to Telluride CO back to Chapel Hill in our 2012 3170DS that already has 11K miles on it.
We are pulling a 2011 Ford Fiesta 4 down and have a couple of bikes on a hitch carrier. Compartments are relatively full but not packed. 2 Adults and 3 little kids. Try to keep the fresh water full and the black/grey empty.
I drive around 62 (rarely faster and occasionally slower) and use cruise. I "beat" the cruise on uphill legs by kicking it into the 3300-3500 RPM range to keep it from taching up over 4K. Very little GenSet usage as I have a big inverter to run the house (except roof A/C) and run the cockpit AC pretty much the entire trip.
Below are my PUMP based MPG and general area of leg.
Chapel Hill to Southern Ohio via I-40/I-74/I-64/US35 - 7.9 (~400 miles)
Southern Ohio to Elkhart IN via US35/US33 - 7.8 (342 miles)
Elkhart IN to Webster WI via I-80/I-39/I-94/US53/WI70 - 8.5 (473 miles)
Webster WI to Forest City IA via WI35/US8/I-35 - 7.3 (279 miles)
Forest City IA to Denver CO (just the tank values as the stops are immaterial)
- 6.7 (Note it was VERY WINDY and a headwind all the way across Nebraska)
Denver to Telluride CO
Telluride to Denver
Denver to Southern IN
- 7.3 (rolling hills and headwind)
I find it interesting that I got such great gas mileage summitting the Rockies on I-70. My guess (based on 4 years of aero engineering that I've never used since!
) is that the air resistance decrease above 5K' offsets the increased horsepower to drag this rig over a mountain. We are pushing bricks through the wind!
Our friends just got a 35' Class A (THOR) and claimed considerably higher numbers coming out to CO but I think that perhaps they forgot to count the full tank of gas when they started! Same engine and probably higher weight without the TOAD.
My total stats for the trip thus far are:
Hi/Lo/Avg Cost Per gallon $3.60/$2.87 / $3.43
Average Cost Per Mile $0.46/mile
Best / Worst MPG 6.7 / 8.5