Colorado's mercy clock is great. It is REALLY hard to run up the score with the running clock. Of course, my experience is that most teams in Colorado have their 3rd stringers in by the time they're up by 35 anyhow.Would be hard to do in High School in Colorado. You have a continuous clock when you have one team gets up by 40. The only way to stop the clock is to take a time out. My son's freshman team went 14-0 between A and B games this year and had a running clock at the start of the second half in all but two games. They never broke mid 50's in a single game (think 52 was the highest) but they were running the ball only in the second half.
Side note: Damn, your kid's school has Freshman A and B teams? My youngest played freshman football for a 5A school this year (Jeffco), and I think most of their opponents had fewer than 35 kids on their roster (one team had 20 kids suited for a game). Big difference from my older son (currently a senior) who had 58 kids on his freshman roster, and all of their opponents had similar numbers. Even then, nobody was running A & B games.
I guess I just assumed COVID depressed the number of players across the board.