New Silverado 1500

I think your mileage will improve a little, seems to on the new vehicles I have had. I also think that it's very important to go easy on a new engine for the first 1000 miles or so. I think GM recommends 500 with no towing now but I always do a little more and I change the oil at 1000. This may be over kill but I was a career A/C maintainer and as an old guy have had a lot of new engines and never had to open one up. It's not as important as it used to be but if you are planning to keep the vehicle, a long time, especially one for towing it will pay off in the long run.