I'm not too concerned in a way that I think it's poor mileage I just didn't want a problem with mine specifically. If after its well and truly run in it still has poor mileage I won't care, I didn't buy the car for that. I just want what was sold to me and a low to mid 9's is about what I'm hoping to get. I'll check back in a few thousand k's with where it's at. Will probably do a stage 1 when I'm bored with it, still plenty of time before that happens.