“The prop bet for Mahomes this Sunday is set at 257.5 passing yards, which is 3.9 yards less than his season average of 261.4.”

The 196.6 passing yards the Bills yield per game makes them the NFL’s seventh-ranked pass defense this season.
In terms of defending against the run, the Bills are 15th in the NFL, giving up 110.6 yards per game.

The Chiefs have the sixth-ranked offense this year in terms of passing yards (246.4 passing yards per game), and they’ve been more effective on defense, ranking fourth-best with only 176.5 passing yards allowed per game.
The Chiefs rank 19th in run offense (104.9 rushing yards per game) and 17th in run defense (113.2 rushing yards allowed per game) this year.
This season, the Chiefs are gaining 5.7 yards per play on offense (11th in the league), while featuring the fourth-best yards per play on defense in the NFL (5).