The flywheel is just a spinning piece of metal. There is absolutely no computer calibration needed. Any loss in fuel mileage is the result of you over reving the car / not maintaining your revs while you shift.
Once you learn how to use your aluminum flywheel (takes a day or two) everyday driving is pretty much the exact same as before.
+1 on the don't get an overly aggressive clutch.
No... really I know how to drive my car with this AFW. I have had it for 3 1/2 years and it feels like it could go another 3 1/2 years. I also drive even slower because of the gas mileage drop. When I am shifting between gears and I step on the clutch pedal my RPMs rise above from where it was at right before I depressed on the clutch pedal. In order for my RPMs to rise fuel has to cause this. With my Factory FW when I was shifting between gears and I depressed on the clutch pedal the RPMs did not rise because fuel was not being dumped. This constantly happening through out the day while I am driving will cause my gas mileage to drop. Unless you can honestly give me a better explanation because I was able to get at least 17 miles to the gallon locally and now I get like 13 and this honestly started right after I put this set-up. Don't get me wrong it feels stronger with the AFW that's why I have had it the past 3 1/2 years.