Last tank got 18mpg just 3 weeks of back and forth to work. 2000mi. on it now.
No steady highway driving yet. Was hoping for 20mpg going to work so a little disappointed for now. At the rate I`m going it may be a year before its fully broke in, but it is improving.
06 GMC Sierra 2500hd D/A-CC/LB 2wd Silver Birch,Linex bed liner,splash guards,Weathertech vent shades,floor liners, GM bug deflector,Draw-tite intella stop brake control,HIR high/low beams.Amsoil BMK-17 dual remote by pass oil filter, funmoto drain valve,ScangaugeII.Isspro A-pillar gauges,Nictane fuel filter kit