IMO, for stock-ish motors the part throttle cruise can be really lean....... but I don’t care for getting them leaned out to the point where they’re kind of “surging”.
It may not be hurting anything, but I can’t tolerate that feeling.
Chrysler Lean-Burn engines ran up in the 18-19 AFR range!
I’d have to say that some of my least enjoyable driving experiences are from sitting behind the wheel of some lean burn equipped Mopar.
You keep pushing the pedal down when going up a grade....... and nothing happens....... until the trans finally kicks down.
Just awful.
From what I understand, the new GDI stuff is more like 50:1 at part throttle cruise.
