Gangly in post #8 has a valid point. Every GM vehicle I've ever bought in the last 15 years brand new has had an electrical gremlin pop up within the first few hundred miles, and all were somehow associated with the brakes. I snag a code via OnStar immediately and get it into the dealership asap. By the time I get it into service the code has cleared, the tech can't find out repeat the problem, and they send me on my way. My 2020 Trail Boss was no different. It happened between 100-200 miles on the odometer. It was never test driven by another potential customer because I bought it while it was en route to the dealer. The electrical gremlin made an appearance while I was driving down the hoary with the cruise control set. I want using the brakes at all. I waited several weeks for the truck to arrive. Now, to answer the original question, I waited 3 weeks before going on a trip. By that point I had over 900 miles of driving around town, etc doing the best I could to get some mileage on it. I knew at the end of the 3 weeks I was driving from Virginia Beach, VA to San Diego, CA. This trip took me about a month because I stopped to visit family in various locations throughout the country. The next electrical gremlin didn't appear until I was only a few hours away from San Diego. Iirc, I had about 5,000 miles on the odometer by that point, and I had only owed the truck about 6-7 weeks. Pulled into the closest gas station, turned off the truck, then started it back up, and everything was good again. Again, when it happened the cruise control was set. Since that incident, nothing else has happened. Just completed a drive from San Diego to Salt Lake City over the weekend. I'm now over 12,000 miles, and has zero problems. Imo, following the break in procedure will allow electrical gremlins to reveal themselves and you'll be able to get them out before you head onto your 700 mile trip. For what it's worth, San Diego to Salt Lake City is about 750 miles. Sent from my SM-N960U using Tapatalk