Looking at buying a Silverado or Sierra with the 3.0 Duramax. I noticed they are offering a max tow package with the 3.73 gears. Don't really need the extra towing capacity with the trailer I'd be pulling, but the little bump in payload would be handy when towing. BTW, I will not be choosing an offroad trim package and the truck will remain stock with me.
Is there a big difference in real world fuel economy?
Thanks