I get 19mpg on the highway empty and 12mpg towing. My 5er is 12k also. I like the diesel for towing through the mountains.
You've already figured out that the D will only average a 3k loss at trade in, so the next question is, will you save the 3k in fuel over the life of the truck?
Like you, I live in the salt and trade every few years. I ordered a '15 last Friday!
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2015 GMC Sierra 3500 Denali CC LB DRW Sonoma Red/Cocoa Dune
2010 Keystone Laredo 316RL
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