One reason for the high game total is because the game will be played in the SoFi Stadium dome. Domes typically inflate scoring. The lack of wind allows quarterbacks to be more accurate, and domes provide a faster playing surface.
This game projects as the #2rd-fastest paced game of the week, with an average of 130.7 seconds per play. A fast pace means both teams will be able to run more plays (130.7 total plays are projected here), march down the field quicker, and have more opportunities to score.
This game has some serious offensive firepower. The Chargers have averaged 390 offensive yards per game this season (#7 in the NFL). The Chiefs have averaged 408 offensive yards per game this year (#3 in the league).
Los Angeles's passing attack has been strong this year, ranking #6 in the NFL with 280 yards per game through the air. The passing offense of Kansas City has been great this season, putting up 297 yards per game through the air (#2 in the league).
The Kansas City Chiefs have run some form of misdirection (either a trick play, trick look, motion, or play action) on 78.4% of their plays this season, #2 in the NFL. Misdirection confuses the defense, puts players out of position, and leads to greater success for an offense.
The Los Angeles Chargers have gone for it on 26.2% of their fourth down situations this year, #5 in the NFL. The analytics show that going for it on fourth down, while risky, ultimately leads to more points.