Vernon Davis may need a GPS to get around Denver for a while. After getting in some extra work with Peyton Manning, the two-time Pro Bowl tight end said he felt the ''energy'' and ''synergy'' that he hadn't felt since the 49ers reached the Super Bowl following the 2012 season. The Broncos (7-0) acquired Davis from the Niners (2-6) in a low-risk trade for late-round draft picks Monday. More...