To bring the mileage back in, it sure goes down the more you use (let run) the remote start. My last tank netted a whopping 11 mpg! Got 12 in my 06 Z71 w/33's. My old 06' with the 5.3 would bog down and kick down into 2nd when going through the hills at 70-75 mph. Now, I just breeze up them without hesitation at all. Might kick down to 5th once or twice, but that is it. Love it!
All of our engines, 5.3-6.2, can haul the 10,500 lbs. The problem is stopping your truck! Making turns! That is when it becomes a scary ordeal that we have to follow specs for.
I cannot even get any of those other trucks to get on it when I am around! I did pull a 2011 Charger with just a plain Hemi, he was pissed. I do not think he could drive?? Then got spanked by a Magnum SRT8....oh well...
Still considering a tune, 6 mo. old, 2300 miles!