2012 LML and I get 18 mpg every day driving and 20/21 open hwy. when pulling my fuzion I get 13 mpg. It weighs about 14,500 loaded. As for a programer I'm not running one yet. I plan on getting one in the future.
www.duramaxtuner.com. The spade tuner is what everyone on the duramax Forum says is the best. But banks is working on unlocking the map on the LML and if they do that's the way I'm going. They told me they should have it ready in the spring.
LSU TIGER FAN
2013 FUZION 310
2012 GMC 2500 HD SIERRA DURAMAX 6.6L