Total QBR: Peyton Manning soars

A look at the AFC West Total QBR leaders through Week 4:

1. Peyton Manning, Denver

Total QBR: 76.7

NFL rank: 5

Comment: Manning had his best game of the year Sunday.

2. Philip Rivers, San Diego

Total QBR: 68.4

NFL rank: 13

Comment: Rivers has had an efficient season thus far.

3. Carson Palmer, Oakland

Total QBR: 63.1

NFL rank: 15

Comment: Palmer is looking for more impact plays.

4. Matt Cassel, Kansas City

Total QBR: 48.7

NFL rank: 23

Comment: Cassel tumbled seven spots after three-pick game in Week 4.