I had my early GDI flashed at the end of April as part of it's annual service. Thought it better to comment after a few miles had been added, as the Laon trip was imminent.
Worst mpg 35 (on the tour & parade) and the best 42 (while travelling) although there must be errors in where the tank fill stop point is.
Generally noted the new revs to 2k on start up (which didn't happen before the upgrade) and the increased burble on the overrun. The exhaust is still sooty though despite 100's of miles at 2.5-3.0k revs. The hesitation at around 3k revs I had though, appears to have gone.
The jury is still out, I will have to compare it with my normal usage
