We just finished a 4300 mile round trip to GA,SC,NC,TN,IN,MI,OH,PA,MD,VA,NC,SC, back to FL. V10 24K Chassis and average 6.88, best 7.6 towing VW Jetta TDI. Two factors affecting mileage 1) use of Generator and 2) minimize fuel in Toad. I use the cruise, and found that 60-63 mph was best even when climbing hills, would cancel it and use accelerator if it down shifted to keep rpms ~3400. When downshifted it would be loud and 5400 rpms, but you could pass trucks on I-77, though they would blow by me down hills. Tow feature is helpful on down hills.