list of gas saving tips from best to worst

[brucepick]

Many thanks, Mira.

I looked at the central isopleth a bit.
What I see is of course first, the central point is right about 2000 rpm.
And as you increase or decrease rpm from the center point you reach the isopleth ring pretty quickly.
However as you increase/decrease load at 2000 rpm, you have a good distance to go before you reach the ring.

Of course, it's just a graphic and changing the scale would change the shape of the central blob. But anyway you can make a case to not worry about load too much as long as it remains midrange, and try keep the rpms near the center point.

In my case with an auto tranny without lockup, 2000 rpm is about the lowest I can run it when cruising over 50 mph before it downshifts. It's pretty happy at around 2100/2200 so I often run it there. I can keep it in or near the optimum range, but I have to pay attention.

Thanks again!