Originally Posted by Gantman
I don't know if you utilized your Tow/Haul mode switch but judging by your speed and rpm's, I'd definitely say you were in 4th gear. What kind of incline or head wind were you facing? Did you ever consider on manually selecting 5th gear to show in your EVIC screen while towing? And I hate to say this to you but with your many years of towing, any speed above 60-65mph will diminish fuel economy by as much as 10% or more while towing. Which reminds me, remember the days where posted max speed limit while towing trailer was 55mph? The optimum rpm's should stay between 1800-2300rpms, give or take, to maximize towing efficiency and fuel economy. I think the speed of 75mph and your rpm's of 3000 were to blame on getting only 8-9mpg. I tow a 3000lb boat with 3.55's at 70mph @ 2000rpms and average 13's. But when I had my 2006 Titan 4x4 with 6" lift and 35" Nitto Muds, I only averaged 8mpg towing 6000lbs at 65mph.
No head wind that I could tell and appeared to be flat. Yes I have tried the manual shift mode and I've tried both the tow/haul mode as well as normal. Yeah I know that towing at 75 will make my mpg's disappear and I was doing that speed, initially, to pass some jack ass who thought getting on the freeway at 40 was ok to merge into traffic. I held it there to see if I could get 5th and be high enough in the rpms that perhaps it would stay there. My normal towing speed is 55-65 on the freeway and highway and I never seem to see 5th gear