Okay, maybe it is silly, but I like obsessing about MPG. I'm trying to decide what mods I want to do to my truck to get the best MPG, but that is for another thread (unless somebody is burning to comment). What I want to know here is how other people calculate their MPG. I started thinking about this when I started thinking about programmers and how they fool the ECM, throwing off the overheads calculations. Are there any electronic devices out there that can give an accurate measurement of fuel consumption during operation? I think the BD Watchdog is neat, but I don't think it will be accurate with a SMARTY running. Side question-does it have an EGT probe or get pyro numbers through the ODB?