I have the 2011 in my sig. 15,000 miles and zero problems. Plenty of power and I often double tow in the Rockies. (the GVW of the double tow is only 8500)
Coming from previous 01 and 05 CTD's, it does not tow like a diesel. No gasser can. I went from "loafing" up the Continental Divide at 2000 rpm to "screaming" at 4500 rpm.
That said, I LOVE my truck!!!! I don't tow/haul real heavy. I'm lighter than a diesel and that is good for off road.
The $8000 I saved over the diesel will buy my gas for the first 20,000 miles!!!
As far as the octane goes I used to buy Phillips 66 as they advertised No Ethanol. I even kept buying it after the sign came down as it was a few cents cheaper than Chevron. But then I realized that the Phillips regular was only 85 octane while Chevron was 87.
Chevron 87 was actually cheaper than Philliips 87 so I switched and I swear it runs better with better mileage. I'm gonna try 89 next time!!!