Hi All, does anyone know of a fuel consumption device that can be connected to a Clarity? I'm disappointed with the readings I get, always 5-6 mpg more than my true mpg, which I calculate after a fill-up (miles driven/gallons pumped). It seems to me, in this day and age, the calculations should be more accurate than they currently are. I would be interested in any thoughts from other owners or the actions they have taken. Thanks!