We just completed a 4200 mile round-trip from Northern Wisconsin to Arches, Canyonlands and Monument Valley. We towed a 21 foot TT, 4700 lbs estimated weight fully loaded for the trip, with WDH and anti-sway bar. We stayed on 2-lane roads most the way, except for a stretch of interstate from North Platte, Nebraska to the cut-off to Moab on Utah Route 128 from I-70 ( a must-see scenic route). We drove over Loveland and Vail passes going out and Wolf Creek Pass coming back. We had the full variety of head winds, tail winds, and no winds, so I figure the wind factor sort of cancelled out. We drove with "eco" on and kept our speed between 55 and 65 mph, depending on conditions, mostly trying to keep the rpms in the 1500 - 2500 range. We don't like to drive any faster pulling the trailer. The car cruised mostly in 7th gear, moving to 8th on flatter terrain with little headwind. When going up long, steep (7%-8%) inclines to the high mountain passes, we found that holding to 2000 or so rpm's caused a drop in speed to 30-40 mph , but we also found that forcing the car above this level of rpm's to increase our speed on these long inclines caused the temperature guage needle to come to the very edge of the hot zone on the heat guage. Staying around 2000 rpm's on these long steep grades gave us plenty of power, and the car cruised uphill effortlessly towing the trail at this level of rpm's, with the oil temp topping out at 246 degrees and the heat guage needle holding steady at the halfway mark of the third quarter of the temperature guage. We got 17 mpg for the whole trip (see photo), but we did a little driving around while unhitched, and my back-of-the-napkin math figures that the trailer-only mpg was about 16 mpg. Love this car!
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