Originally Posted by 2 for the road
I have a 2012 Silverado with a D/A. I use tow haul 99 percent of the time. Our trucks don't want to shift into overdrive until about 67-69 mph on the flat. So what I do is once up to my cruising speed of 64-65 mph I disengage the tow haul, the transmission shifts into overdrive, then I re-engage tow haul and go merrily along my way in overdrive. Other option is to get up to 67-68 mph and let up on the pedal and it shifts to overdrive, set the cruise at 65 and go merrily along the way.
Exhaust brake, I use in hilly terrain and once I exit the expressway. I like the extra help with stopping.
I will have to try that, I drive at 63 mph, maybe I am not going fast enough. Now days I try to stay off the interstate and 60 is about what I run. I keep truck in tow haul and mostly with the exhaust brake on. I wish I got better fuel mileage.
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