It does not run rough (at least not too often) or misfires. It has 108,000KM's (yes I'm Canadian) and isn't under warrenty anymore. There is an extended warrenty, but it doesn't seem to cover fuel issues. The smell is only when you are idling. As for fuel mileage, it seems to be getting close to what it is rated for and it doesn't seem to have sluggish acceleration, as most of the time I get whiplash trying to slowly accelerate and it does not like to do that. I will look into the vapor management system and see what that is all about. Thanks for the advise so far.