Originally Posted by
Jetfixer
It's been about 3 weeks since I got my ECU back from the Stage 1 flash. The difference is amazing! However, I have always used 89 octane non-ethanol fuel. The bike had a full tank when the ECU came back. There was actually a slight increase in MPG after the flash, especially considering how many times I "tested" the flash! I've always gotten about 40 MPG according to my Acar app records. I then switched to 93 octane premium fuel with 10% ethanol. After two tanks of this fuel, my mpg has dropped to 36. I know that the ethanol causes lower MPG. I think there has only been a slight increase in power using the 93.