On Fire is based off a formula using the player's stats. It represents what percent of the time the player is "On Fire" (for example, "15" means the player has a 15% chance of being "On Fire" during any game). When a player is "On Fire" he has a better chance of performing well. Think of it as being "in the zone" for the game. Keep in mind, there's no guarantee of success - even players who are "On Fire" can go 0-fer.
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