LSU Coach Les Miles has signed a contract extension that will keep him with the Tigers through 2012. The deal was approved Thursday by the LSU board's athletic committee, apparently ending any chance of Miles leaving for Michigan to replace Lloyd Carr, who retired last month. The approval of the full board is needed, but that is considered a formality when the board meets Friday. The contract doesn't change Miles' salary, which will already rise to at least $2.8 million annually based on LSU's Southeastern Conference championship this year. If LSU wins the national championship, the contract provides Miles would become among the nation's top-earning college football coaches. University officials estimate that would put his annual earnings somewhere between $3.2 million and $3.5 million. LSU (11-2) faces Ohio State (11-1) in the Allstate BCS Championship Game on Jan. 7 at the Louisiana Superdome.