And that was my assumption: But just an assumption for me. The owners manual is really vague about it. I think its a two sentence explanation. But reading archived posts. There are claims that mileage is the same (or better) So if that is the case. The rpm shift point change must still be well below its limits.
It just seems to me that more of anything I.E. food, wife, or power typically has a cost. Whether it is fuel or maintenance or whatever.
I have not used the button yet other than to see if the lights light.