Yup... stock tires/rims. Good thinking though... that would possibly explain it.
So no one else sees their calculations off? Interesting. My butt dyno also tells me it is a little down on power. Not a lot but it feels slightly sluggish compared to a couple of months ago when I bought it. Maybe I'm just getting used to the power but it feels like I need to prod it more to merge to the highway and such. Maybe I'll just have to take it in and see if it's throwing any codes.

--Bill