Using DFCO to increase your MPG

[STC]

I appreciate this Forum Thread. I’ve been using DFCO all the time since I read this thread. FE improvements have been incredible. Presently, I’m near making the 50 mpg range. This is a goal of mine to reach, before I use more advanced techniques.

I have a silly question? Does any one know?

There is a long mountain grade I drive every day. I let off the gas and use DFCO when I go down it. The long grade starts to level and my vehicle’s RPM drops down to around 1,000 – 1,100 RPM. But, then the grade steepens quickly causing my RPM to go back up to over 1,800. My MPH does drop down when I reach 1,100 RPM, but there are hardly any drivers, so I can do this...

Does DFCO kick back in automatically when the RPM goes back over 1,100? Or do you have to give it some gas (accelerator tap) over 1,100 RPM and then let the grade take over again? Is the Yaris ECU software designed to do this automatically? When the RPM gets just below 1,100 RPM and then climbs up again, I do nothing... just coast in the gear till I have to slow down and come to a stop at the bottom of the mountain.

Cheers...