SAN DIEGO — Brian Johnson kept No. 8 Utah on a BCS-busting course by throwing a career-high five touchdown passes in a 63-14 win over San Diego State tonight.

Utah (11-0, 7-0) clinched at least a share of the Mountain West Conference title. The Utes will try to finish the regular season undefeated when they host No. 16 BYU in their big rivalry game on Saturday.

Utah was the original BCS buster in 2004, becoming the first team from an outsider conference to crash the Bowl Championship Series. Those Utes finished 12-0 after routing Pittsburgh in the Fiesta Bowl.

SDSU (1-10, 0-7) lost 10 games in a season for the first time and the Utes never had to punt.

Utah was already up 49-14 when Deshawn Richard had two interception returns for touchdowns in a span of four plays late in the fourth quarter. His first went for 89 yards and his second was for 38 yards. Both passes from redshirt freshman Ryan Lindley were tipped.

Richard was the third Utah player with two touchdowns.

Johnson threw all five touchdown passes in the first half, giving the Utes a 35-7 lead. He was one off the school record. Utah scored on its first three drives and five of its first six against the outmanned Aztecs. Johnson had 228 of his 283 passing yards in the first half. Overall he was 27-of-38.

Johnson threw touchdown passes of 4 and 5 yards to Freddie Brown, 32 and 3 yards to David Reed and 2 yards to Colt Sampson.

As if they needed it, the Utes got a gift on the game's first play from scrimmage when SDSU's Tyler Campbell fumbled at the end of an 18-yard run, with Koa Misi recovering at the Utah 47. Johnson hit Sampson with a scoring pass seven plays later.

Utah's Matt Asiata took a direct snap and scored on a 1-yard run early in the fourth quarter. Ray Stowers added a 1-yard TD run on Utah's next drive.

There were a few bright spots for the Aztecs, who have beaten only Idaho this season and are 8-27 in three seasons under coach Chuck Long.

Jose Perez intercepted Johnson at midfield early in the second quarter to set up SDSU's first score, a 31-yard pass from Lindley to Darren Mougey.

On the first drive of the second half, Johnson was stuffed on fourth-and-goal from the SDSU 5-yard line.

The Aztecs then moved 95 yards in 17 plays, with Lindley throwing a 16-yard TD pass to Justin Shaw.