NFL: Denver 37, Oakland 6 30 (UPI) -- Peyton Manning turned in his most impressive performance since joining Denver Sunday, hurling three touchdowns in the Broncos' 37-6 rout of Oakland. Manning completed 30-of-38 passes for 338 yards in his fourth game since coming to the Broncos as a free agent in the off-season, sparking Denver to 27 unanswered points. Willis McGahee helped the Broncos (2-2) break a two-game skid with 112 rushing yards and a touchdown. Demaryius Thomas made five grabs en route 103 receiving yards. Star running back Darren McFadden was limited to 34 yards on 13 carries for Oakland (1-3). Carson Palmer passed for 202 yards on 19-of-34 efficiency in the loss.