oxi
Adventurer
With the 2.7 you're right you should watch the weight that you load the truck down with, but at the same time I've been kicking the **** out of my 2.7 since the truck was first released in 2005.
Below is what my truck looked like, on 285's with my sport bike on the back, my buddies touring bike on the trailer, and gear loaded down everywhere. The whole time from DC to San Antonio I averaged 16 mpg and had no problem cruising with traffic. It's no racecar, but don't sell it short.
Do you have factory 16x7 with those 285's? Are they 285/75?