So today I decided to Seafoam the Av to see if that would help out with the gas mileage. I put about 1/3 of a can through the brake booster vacuum line and shut it off for about 15 minutes. When I started it back up I was expecting some huge cloud of smoke like in all the videos I've seen but all I saw was a tiny little bit of white smoke and then it was gone. Did I do this improperly? Should I have put in more seafoam or was my intake system already clean to begin with? I think I might also go buy the spray bottle for the throttle body and use that.. What are you guys thoughts? 08 Av 5.3L w/ 70k miles. New plugs and new wires.