Learning curve? If that was all there was to tuning EFI, everybody'd have it. I have a local friend who does high end restorations and builds. Almost all are LS powered with some sort of aftermarket EFI. Almost every one of his ends up "unfinished" because once he gets them "running" his customers rarely want to spend the 800 or so dollars to send it out to get it tuned. ......and to get them dead right, you have to have a dyno. I always thought that was rather funny that a customer spending between 75 and 100K on a build or restoration balks at 800-1000 for a tune, but almost every one of them do.....and then their junk only runs as a shadow of itself and they ***** to everyone they can find what a shitty job the builder did. No, there's much more than just a learning curve. At least with a carburetor, you can figure it out between you and the dragstrip.