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I owned a '99 V-10 5-speed for 10 years (186K miles at trade) and I have a new '09 3-valve V-10 auto (16K miles.)
My trip from TX to AR and back last weekend netted me 13.2mpg running 75mph with camping junk in the back; I have noted a 2mpg loss between the 5-speed and the auto (and the old 2-valve vs new 3-valve motor.)
The only experience I have pulling a trailer with my old '99 was a 24' camper from Durango back to TX, I averaged 8-9mpg running 75-80mph on the interstate.
I have found the V-10 to be extraordinarily reliable, the only thing I ever did to my old '99 was change the plugs at 110K and replace the AC pump at 160K. That's it. I expect the 3-valve to be as good. Towards the end of the '99's life, I had to run Premium to keep it from detonating; my '09 is already starting to get picky about fuel and I'm having to fuel up with name-brand gas (Shell/Chevron/Texaco) to keep it from knocking.
I believe the V-10's are still available for 2010 but if you do a search you might be able to find more current info here.
I think you are stuck with 4:10 rears, you may have to go to aftermarket if you want to run bigger tires but someone here also may have a better solution to that, particularly hauling loads at high altitude. Much of it depends on your setup (chip/intake/exhaust, etc)
...it also may be easier to start in those cold Colorado mornings!
Good luck!
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