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Old 03-23-2007, 11:03 PM   #37
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Does this come with that Ebay +20 HP speed module?
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Old 03-24-2007, 11:10 PM   #38
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I'd have to say it works! Just keeping the technique in mind during my normal driving, on my most recent fillup I got 42.9 MPG, compared to a previous best of 41 and an average of about 38-39. Nothing scientific about my observations, but I'm convinced. I do live in hilly country, which probably makes more of a difference. Thanks for the tip!
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Old 03-25-2007, 11:10 AM   #39
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The only mod I have made to my Yaris so far ... I used 2.5oz. of Lucas Fuel Treatment at my second fueling.

My efficiency on that tank was 43.67 MPG.
I totally agree with the use of the DFCO, it also saves the brakes. whenever it's possible put the engine in compression, the car will also be more stable when braking.

About that Lucas treatement, not sure what it does, but one time a mechanic put a bottle of a strong injector cleaner into my civic gas tank, that increased dramatically the mileage, something like 25% more on the highway. now that it's good but it comes with a cost
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Old 03-25-2007, 11:56 AM   #40
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SO WAIt? us AT should never switch it into third over about 55mph?
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Old 03-26-2007, 08:26 PM   #41
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SO WAIt? us AT should never switch it into third over about 55mph?
We're not speaking about the passing gear you can invoke by pressing down a bit on the accelerator while in overdrive, but manually selecting "3" on the shift tree.

I'm not positive about 55 MPH as a hard limit but your owner's manual will have the definitive information. Also remember that we're speaking about dropping into "3" for a deceleration effect, meaning it will place a lot of load on the engine that wasn't there just a second before, wile accelerating past 55 MPH in "3" would have built RPM gradually.

This is why I say that 55 MPH is a good cut-off point.
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Old 03-29-2007, 02:40 PM   #42
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[


Does this work on both the manual and automatic transmissions (MT and AT)?

Yes, but it is much more efficient with the MT. The MT can achieve DFCO in any gear as long as the clutch is disengaged (meaning you don't have it pushed in) and your foot is not touching the throttle, while the AT can only achieve DFCO with a gear selection lower than D (overDrive), i.e. 3 or L.

Help me understand this.. I should begin using the 3 - L positions on my A/T Yaris to slow down? This is how to activate the DFCO?

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Old 03-29-2007, 04:02 PM   #43
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Help me understand this.. I should begin using the 3 - L positions on my A/T Yaris to slow down? This is how to activate the DFCO?
That's correct, whether slowing down for a stop or just trying to maintain a certain velocity (i.e. on a downhill run).
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Old 03-29-2007, 04:23 PM   #44
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That's correct, whether slowing down for a stop or just trying to maintain a certain velocity (i.e. on a downhill run).
Hrrm,

So shifting into 3rd (or lower) won't just create engine braking? Or at least just cause higher revs?

Ok I'll try it..
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Old 04-07-2007, 09:09 PM   #45
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The original post has been updated with solid timing data as well as info on DFCO with a ScanGauge II.
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Old 04-07-2007, 09:15 PM   #46
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I still don't understand how this is more fuel efficient than just coasting in neutral.
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Old 04-07-2007, 09:29 PM   #47
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If I understand it right....idling in neutral still has gas going to the engine (small amount but enough to keep it running), while this totally cuts gas off to the engine during this period (nada/none even while the engine is rotating).....correct???
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Old 04-07-2007, 09:34 PM   #48
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If I understand it right....idling in neutral still has gas going to the engine (small amount but enough to keep it running), while this totally cuts gas off to the engine during this period (nada/none even while the engine is rotating).....correct???
I think that's the idea... but regardless... say you're coasting in neutral at 40mph down a gradual incline, you'll maintain that 40mph for much longer in neutral coasting than in 3rd gear. Right?

I would imagine that in 3rd gear... you would come to a slowdown much more quickly having to use more gas.
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Old 04-07-2007, 09:43 PM   #49
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AustinYaris,

churp hit it dead on. As for costing in N vs. 3 I don't know if you have the AT or MT but with my 5MT I can maintain my speed in a 5th gear DFCO on as little as a 2% grade.

Part of taking advantage of DFCO is selecting the right gear for the scenario. As I've mentioned a few times before this is where the MT really outshines the AT but the AT is by no means unusable for this.
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Old 04-07-2007, 09:54 PM   #50
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AustinYaris,

churp hit it dead on. As for costing in N vs. 3 I don't know if you have the AT or MT but with my 5MT I can maintain my speed in a 5th gear DFCO on as little as a 2% grade.

Part of taking advantage of DFCO is selecting the right gear for the scenario. As I've mentioned a few times before this is where the MT really outshines the AT but the AT is by no means unusable for this.
Ah... I see where I was confused... the 3rd gear thing really only applies to AT... I actually have a MT.... So you can use DFCO in the other gears... For some stupid reason, I thought DFCO would work only in 3rd gear regardless of MT or AT. Anyways.. I just got my Scangauge II today. I'll have to try out this DFCO. I'll post my results in a few days.
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Old 04-08-2007, 10:02 AM   #51
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hmmmm...i've been doing this ever since...of course to save gas..i know im not using gas coz im not hitting the gas pedal..
....very good information
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Old 04-08-2007, 03:55 PM   #52
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something else i'm curious about when using this method: when is the best time to switch back to overdrive? do i switch back before i press my brakes? after i've some to a complete stop? before i press the accelerator again? does it even matter?
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Old 04-08-2007, 07:11 PM   #53
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Lillydot,

Don't go back into OD until you reach a complete stop or are ready to accelerate again. That way you're sure to get the maximum benefit of a DFCO.
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Old 04-12-2007, 02:00 AM   #54
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ok, I don't really understand how this would work.

How does it completely cut off fuel flow? Won't the engine stall? Or is that the point?

If you're coasting in 4th gear foot off the gas it shuts off the engine...but then when you touch the gas it starts the engine back up again?

How can the engine keep turning over when there is no fuel to ignite and push the cylindars back down?

I'm confused.
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