I wouldn't want the new software but I'm not a greenie. I read it had something to do with the injector pulses so it's a very minor tweeking of the program. However, the engineers preferred the other program for a reason, most likely driveability. The eco tune is undoubtedly leaner, probably feels alot flatter, lazy, and it wouldnt surprise me if it had a lean miss at light throttle and or idle.