Modifications to a new truck to increase MPG?

[cbartists]

Hi, you are all probally bored to tears with my request, but what modifications can I make to a new 2008 Chevy Silverado 2500 HD that will legitimately increase my MPG - even just 1 or 2 MPG.

Please don't get too down on me for my choice of vehicles. My other car is a Subaru. The truck will only be driven when our needs require it. Probally will only put 4-7,000 miles on it any given year. We need a 3/4 ton truck, that is the bottom line. I would have gotten a hybrid 1/2 ton but it will not suffice. A deisel engine is not a good choice for our high altitude, very cold climate (often -34 in winter when starting vehicle, many weeks -20). There is no biodiesel available and pure vegi oil is not a viable option here.

I already employ the basic fuel economy recommendations and I ride my bike almost exclusively. (I can ride my bike to work and to run all my errands). I even have studded snow tires on the bike so I can get to ride in the winter when we have 4-5" of packed on the roads for 5 months of year. (At least for now).

I have been reading and looking at the various aftermarket products that one can add to their vehicle and am interseted in which of these are valid. Any comments, suggetions, advice etc is greatly appreciated.

CBARTISTS