I don't think he doesn't like you, I can definitely see his point of view. In this day and age, I would expect a few baseline maps for the most common configurations available (intake/cat back and new turbo, maybe a downpipe version as well), available for the most common tuners. So much can be...
I'm sure the average age of the owner will fall when they're widely and readily available. Most young folks can't afford to wait for a car, their first new car is typically a result of their current car falling apart and needing emergency replacement. When you can walk in and buy an XL or XLT...
Once you change tire diameter, you can't rely on that anymore unless you have a tuner that allows you to adjust your programed tire size. You drove further than the computer realized, meaning your estimate was based on flawed data.
Harder to tell with a hybrid, but I wouldn't expect a 7 mpg...