We own two 2019 Silverado 1500s. My wife's is an RST, mine's an LT, (I am I like chrome guy). Both have the 5.3L engines. We both use mid-grade Shell or BP gas. We get our best MPG from these two gasolines. As both engines appear the same, the RST will outperform the LT. In the following, I am referring to the **** on the top left of the dash. Left is for tow-haul and right displays a green flag in the display in front of the steering wheel. With the RST in normal, (no green flag), it accelerates better than my LT with the green flag on? Is there a different chip in the RST? I want my LT to perform as well as the RST if that's possible. Both trucks are in AUTO drive.