I always attribute a 2-3 mpg decline during the colder months to Winter-blend fuel. We see it in all of our vehicles. Later in the Spring it pops, no pun intended, right back up to where it was the past Summer. Brew <img src="/forums/images/graemlins/cheers.gif" alt="" />

98 T100 SR5 4x4 3.4L auto, TRD Goodies, Bilsteins, engine/TC skids, 2" body/d.train lifts, F/R ARBs, 4.56 R&Ps, Aisin hubs, 255/85R16 Dunlop Rover RVXTs (street), 16x7 +8mm offset wheels, custom bumpers, Warn M8000, Master-pull synth. line