Thanks guys for clarifying this for me.
Indeed I have mistaken the "sweet spot" on the BSFC.
I'll adjust my driving accordingly.
But it's better to accelerate to say.. 70km/h, and then do a EOC down to 40km/h and repeat.
Rather than cruising with low RPM on a high gear constantly on 50-60km/h?
I have some places in my regular commute where EOC is bothersome though, I'll let the engine hum along nicely at those parts then.
