I drive a 06 Chevy 2500 with the 8.1 gas engine and Allison trans for the last 7 years. I get 13 miles empty and no worse than 11 mpg towing no matter how heavy! I can tow with any diesel 3/4 ton out there without all the maintenance costs and high priced diesel. Also when I bought it I paid about 10K$ less for it than the same truck with a Diesel engine. Never had any issues, I just keep my oil changed and fluids and filters fresh.
