I have a 2009 with 5.7 that i have 89k on and so far just add gas and it goes. The truck runs really well for a 6" lift with 35's I out ran my buddys new 2011 ford diesel that is supposed to be bad to the bone. lol made him sick..... I get 16-17 on most tanks of fuel but i cant just put around in the eco mode. My eco mode will only stay engauged when i am rolling less than 60 mph scense i went with the bigger tires, with the stock tires i could run 70 mph with 4 cylinders (eco). I personally would not buy a high priced new diesel truck unless you tow real heavy loads alot. The only downfall i have found in my truck is the rear coil springs are weak when hauling. I fabbed up some 3/4 air bag helper deals on mine and run about 20 psi in them and it made a world of difference on handling a load. All in all i feel it is a great truck..
Ohh and a side note: the truck has some sort of a coorection system built in and knows when the truck is in a skid and WILL correct you if the truck is out of control. About a year ago i was driving in heavy rain when a bmw in front of me hit water and started hydroplaning sideways Car on each side of me i had no choice but to slam on my brakes too, my truck slid completely sideways going 70 or so, the light on the dash flashed and i swear the steering wheel and the brakes had a mind of thier own... the truck was headed the right way and in control in a matter of seconds and stopped about ten foot short of the bmw that had made about two 360's in front of me. The people at the dodge dealer had not told me about this function. later that day after changing underware i read about it on line. it is the same system that mercedes has been using for a few years... my daughter will be driving my truck or one like it when she gets her license. enough bragging for now...
i am not sure if it comes on all ram truck modles or not but it is on mine and i am glad.
