The best mobile app for traffic IMO is Waze and it will also show you local fuel prices along with a bunch of other great free features; however, the fuel price feature must be unlocked by using the app while driving the prescribed distance set by the developers. Sirius is definitely lacking in those two departments, not to mention others. GasBuddy will definitely do the trick for fuel prices alone. I wish that ford had adopted something a little more along the line of Pioneer's AppRadio its such a great system and provides a user with choice.