Using DFCO to increase your MPG - Toyota Yaris Forums

BailOut · 03-13-2007, 01:09 PM

@eTiMaGo:

Thanks for the information! My ScanGauge II hasn't arrived yet (I got in with the group buy on PriusChat so it should be here shortly) so I'm glad someone else is providing hard data.

@Nutzoids:

It sounds like you're making progress, and that's great. :) No, using the friction brakes will not disengage DFCO. The 3 ways you will leave DFCO are:

1) Touching the gas pedal.
2) I don't know the exact RPM yet but if you drop below about 6 MPH in any gear the ECU will start sending fuel.
3) Using the clutch on the MT or using overdrive on the AT.

For example, using just the brakes (no clutch) while engine braking will not affect DFCO at all, and this is how I dump extra speed on short, steeper sections of the downhill parts of my mountain commute.

Nutzoids · 03-13-2007, 01:38 PM

Quote:

Originally Posted by BailOut

The 3 ways you will leave DFCO are:

1) Touching the gas pedal.
2) I don't know the exact RPM yet but if you drop below about 6 MPH in any gear the ECU will start sending fuel.
3) Using the clutch on the MT or using overdrive on the AT.

For example, using just the brakes (no clutch) while engine braking will not affect DFCO at all, and this is how I dump extra speed on short, steeper sections of the downhill parts of my mountain commute.

Good to know!

Nutzoids · 03-20-2007, 03:17 PM

Yo BailOut,

So I did a full tank of gas using your DFCO method... and even though there was a big snow storm here are the results!

03/12/07 - 03/19/07

305 Miles on tank... 29.65MPG

Which is on the high side of my MPG, but nothing outstanding... My highest was 31 (Back when I was breaking in my car)

Like I had said earlier... it was more convenient, didn't have to stop at red lights and stop signs!

So yes I can see where it will help, but don’t expect too much… I will continue to do it until my next oil change… but this was the first tank!

03-13-2007, 01:09 PM	#1
BailOut Steals terrorist's lunch View User's Garage Drives: 2007 Yaris Liftback Join Date: Mar 2007 Location: Reno, Nevada, USA Posts: 1,299	@eTiMaGo: Thanks for the information! My ScanGauge II hasn't arrived yet (I got in with the group buy on PriusChat so it should be here shortly) so I'm glad someone else is providing hard data. @Nutzoids: It sounds like you're making progress, and that's great. :) No, using the friction brakes will not disengage DFCO. The 3 ways you will leave DFCO are: 1) Touching the gas pedal. 2) I don't know the exact RPM yet but if you drop below about 6 MPH in any gear the ECU will start sending fuel. 3) Using the clutch on the MT or using overdrive on the AT. For example, using just the brakes (no clutch) while engine braking will not affect DFCO at all, and this is how I dump extra speed on short, steeper sections of the downhill parts of my mountain commute. __________________ - Brian Share the Road I often carry 2 carpool passengers and mountain bikes or snowboards/skis over a 4,500 foot elevation difference. Click the graphic above to see my detailed mileage logs.

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03-20-2007, 03:17 PM	#3
Nutzoids View User's Garage Drives: 07 Yaris Liftback Join Date: Nov 2006 Location: Philadelphia Posts: 938	Yo BailOut, So I did a full tank of gas using your DFCO method... and even though there was a big snow storm here are the results! 03/12/07 - 03/19/07 305 Miles on tank... 29.65MPG Which is on the high side of my MPG, but nothing outstanding... My highest was 31 (Back when I was breaking in my car) Like I had said earlier... it was more convenient, didn't have to stop at red lights and stop signs! So yes I can see where it will help, but don’t expect too much… I will continue to do it until my next oil change… but this was the first tank!