Originally Posted by bsmuwk

I do all my own work. Dealer works on my car for free. They had a car on a scope to tune fuel management I believe. They took the car for a few test drives with some computer in their hands after checking codes and clearing the computer in the shop. I don't know what they did, but the car improved fuel economy ten-fold and responds much better when it doesn't stumble.

All parts have been replaced with new Bosch components as well.