Even though the returns don't increase monotonically with Excess VIX, we can see a slight trend. (quantfiction.com)
We'll see if the Patriots can buck that slight trend: (sbnation.com)
Since 2008, 51.2 % of NFL regular season games have gone «over» the total, indicating there is a slight trend towards «overs», yet not enough to cover the juice if assuming a normal -110 vig. (sportsinsights.com)