Thanks for this realistic response. I have been using mainly 2 fueling stations. But of course on long trips the fueling stations vary. Trunk is clear all the basics are out of the way since I have alot of poor mileage posts. I haven't read any posts on here that complain about mileage where people actually brought in, let alone a fault being found. What do you think those chances are? I only see posts about poor mpg are on cars with more mileage and needing spark plugs or something...Expect to be chared a diag fee. If a fault is found, the fee should be waived as it's a warranty repair at that point.
What specific gas are you using? Have you tried fueling at a different station? Verify the air cleaner is still clean. If you're hauling #500 of dead weight in the trunk, get rid of it. Essentially get all the basics out of the way.