I'm confused about the bsfc map. How do they get the "islands"? I understand the straight line, but don't get where the circles come from. Are those based on the change in throttle opening?
Also, what makes the red island the best? Why doesn't highest load and lowest RPM produce the best BSFC (and thus MPG)?
Hopefully, this isn't painfully obvious where I'm just overlooking something. I'm probably just slow...
