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Old 11-09-2011, 01:57 PM   #199
flg
 
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Personally, I'm noticing that it works below 1100rpm unless I'm over 75mph. it dosen't work at all over 75mph? What is this over 75mph sh$%t getting stuck on 125-135mpg down a hill???
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Old 12-13-2011, 08:02 PM   #200
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I had always been curious about this. I bought a 2nd hand (AT) 2 DR hatchback, and didn't really know much about the Yaris.
By nature, I'd always coast as much as possible instead of the vroom-skrrrt everyone else did and noticed the engine sounded much different when I did.

I presumed it was engine braking or something. Good to know I'm saving gas.
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Old 01-16-2012, 03:33 PM   #201
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DFCO and engine braking...

When I bought my '08 3-door...I noticed a considerable engine braking when I took my foot off the accelerator! When going to work I have to descend down a long steep hill. My Jeep Liberty always required considerable braking to keep it down to the speed limit. With the Yaris, being much lighter and DFCO, the vehicle will coast down at about the speed limit without any braking required.
I could literally feel the engine compression helping to keep the speed down.
Felt like a miniature Jack-Brake was on.
I once had a Mazda compact pickup...coming down through the mountains one time...I thought that I would have to replace the brakes by the time I had gotten down (even in low gear). The Yaris just stays at about 30-40 mph.
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Old 01-22-2012, 12:45 PM   #202
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I don't have a Yaris (yet) , sorry. But DFCO can be a useful tool if/when you use it for slowing down or controlling speed on steep hills. For gliding, not so good. In my automatic Civic , it works in any gear , and at any RPM above 1000. For those who are not sure if they are in DFCO mode, you can usually feel the deceleration, or if you can't, your SG2 will show 9999 MPG (or 0.0 l/100km). You guys have ScanGauges , right ?

But I'm pretty sure that any "hypermiler" from CleanMPG doesn't try to glide in DFCO.
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Old 01-22-2012, 01:04 PM   #203
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"the end user can induce DFCO conditions more often than 'natural driving' would
by adjusting how they use the kinetic energy of the vehicle, and the gas pedal and gear choices"

My keyboard is acting up ; I can't seem to make it highlight the text I want to present as a quote. This guy (127.0.0.1) seems to know a thing or two. Or at least I do not disagree with his post , lol. Does anyone know why he was banned ?
For my driving (not many steep hills) I find that invoking DFCO is most useful for driving with load (DWL) in traffic. When you maintain the proper interval , DFCO can mean you don't need to touch the brake when the person in front of you hits his. Any sudden lift of your right foot should put you in DFCO.
My findings/comments are based on my experience with my Civic automatic , which apparently works a little differently than the Yaris with regards to DFCO.
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Old 04-11-2012, 09:09 AM   #204
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is there a video of how exactly one can accomplish this? :)
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Old 05-16-2013, 02:53 PM   #205
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is there a video of how exactly one can accomplish this? :)
very simply, when you take your foot off the gas it happens, except as you slow down and the engine RPM's drop below around 1100 rmp the ECU starts supplying fuel again, to avoid stalling the engine.

Automatics do it too, but not as quickly, depending on the gear engaged.

Downshifting to slow the car when braking of course is the same thing, foot is off the gas. If the DFCO did not happen you would not get much engine braking.

It's really very simple, and you don't need to know anything about it for it to work. Knowing that it is cutting off the fuel will help you to decide to either coast with the clutch in or or out, depending on how much engine braking you need.
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Old 05-16-2013, 09:41 PM   #206
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Old 05-17-2013, 11:09 AM   #207
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you don't need to know anything about it for it to work
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Old 07-24-2013, 07:35 PM   #208
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Haha this old thread was stickied so I assume it doesn't matter as much when people revive it.

Anyways, I've noticed the DFCO on the Yaris is not very noticeable on a manual transmission. With DFCO, my Yaris doesn't lug as bad as my civic did and I'm able to coast more effectively. Still getting 37-40mpg while hitting up to 85mph on the freeway and maintaining at least 70mph. Still rather impressive compared to my old civic which did around 30-33mpg.
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Old 11-03-2013, 06:28 PM   #209
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When I brake going down a hill near my home the car feels like it downshift, it slows the car down so much that I have to accelerate to get the car to shift back to OD. I hate it, make me so mad some times that I floor board it to get going again. Is there a way to avoid this idiotic function?
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Old 11-04-2013, 12:27 AM   #210
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When I brake going down a hill near my home the car feels like it downshift, it slows the car down so much that I have to accelerate to get the car to shift back to OD. I hate it, make me so mad some times that I floor board it to get going again. Is there a way to avoid this idiotic function?
Trade it in and get a manual (I couldn't resist ).
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Old 11-04-2013, 11:54 AM   #211
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Since you don't have a manual tranny, try sticking it in neutral so that it will roll free, if you want to coast. However, if you are braking you want the engine holdback.

If you needed to brake just a little bit, then want to coast again a small tap of the gas should tell the transmission to up shift again. Flooring it will make it want to downshift even more.

Automatics are really Nannytrannies.. they try to decide for you what you need. Manuals are for those who want to be in control!
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Old 09-15-2014, 09:58 PM   #212
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Is this avaliable for the 2nz-fe?

I love the back of my car, the front... not so much
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Old 10-04-2014, 03:52 AM   #213
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Does the 2002 d4d have this?


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Old 10-08-2014, 05:33 AM   #214
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It doesn't wear out your clutch to coast down hill in gear.
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Old 10-25-2016, 11:20 PM   #215
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I think it works.

I read about this DFCO thing and give it a try. 2013 Yaris Sport with manual transmission.
Got to say that I filled my tank with premium quality fuel, I over-filled it to the point of some fuel spill. I drive in the conservative zone of 40 mph to 60 mph.

Set the controls to monitor MPGs... When I lift the foot off the throttle that MPG monitor is set to 9999... I hit the throttle pedal and the MPG numbers started to flicker and constantly change. Low numbers if I press it to hard, good high numbers if I keep it in a sweet-spot of 45 mph / 55 mph.

Used the A/C just a few times minimum.

I am impressed that I was able to get over 80 driven miles on the over-filled fuel before the fuel gauge needle sets at the FULL mark and began to monitor fuel consumption.

So far I got 262 driven miles with half tank (drove a bit harsh on the weekend) and I think I can get 400 driven mikes when it goes to E (empty)

Average MPG monitor got better ratings too, from a 24.7 mpg to 38.5 mpg.
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