Help with towing performance and MPG

[wtpops]

Hello, I have a 2005 GMC 2500HD crew cab Duramax with 175,000 miles on it. Its running great and have had no problems with it.

I know nothing about all the aftermarket ECM programing products on the market.

I dont want to turn my truck into a hot rod or cause any damage to it. What i am looking for is something that will give me a little more torque and MPG. Money is not a big issue within reason.

Can anyone post some suggestions as to what i might look at as far as programing options.

Thank you.