So you don't have a ScanGauge II. Hmm What r u waiting 4? Quick read!

[digital rules]

I thought DFCO works all the way down to 1000-1100 RPM's in most cars?

Over time, it will become second nature as to whether coasting of DFCO is more appropriate for the given situation.

[FordFiestaS]

Originally Posted by digital rules

I thought DFCO works all the way down to 1000-1100 RPM's in most cars?

Over time, it will become second nature as to whether coasting of DFCO is more appropriate for the given situation.

My car is definitely 1,500 rpm's. I've watched it everyday as I coast in gear downhill to work, I start out less than 1k and as I get momentum thus higher rpm's, the MPG's go to all 99999's at 1,500. Drop below that and the MPG's change quickly to a couple hundred.

[digital rules]

1050 RPM's for the Corolla. You can really feel the engine going in & out of DFCO when coasting in 1st gear. Right in line with the UG display.

[Daox]

Originally Posted by FordFiestaS

I only leave it in gear and coast when I would otherwise have to use brakes to maintain posted speed limits, keeping the rpm's above 1,500 in the case of my Fiesta S. The fuel cut off point for it.

Otherwise yes, I coast in neutral always.

An I correct in my thoughts?

Pretty much. The only other time I use DFCO is if I know I am going to have to stop.


DFCO operates differently in every car Ive driven. You just need to learn your car.

[H-Man]

Originally Posted by mechman600

I think you know the answer to that!

Be aware that if you are trying to coast, DFCO should be used as a last resort. Why? It all comes down to engine speed. In order to DFCO, the revs have to be above 1500, which takes considerable more energy than idling at 700. Sure, no fuel is being used during DFCO, but it still requires energy, which is provided by the kinetic energy of your coasting vehicle, which was previously provided by gasoline (accelerating up to speed). You can feel the energy loss - the way the vehicle decelerates quicker when you are in DFCO vs neutral coasting.

My car will hold DFCO until idle for that speed so I usually downshift at 850 rpm. I can't get a good enough line of sight to be able to coast to a light EOC but I can in DFCO and have it turn green so I don't use brakes.

[deejaaa]

Originally Posted by mechman600

I think you know the answer to that!

Be aware that if you are trying to coast, DFCO should be used as a last resort. Why? It all comes down to engine speed. In order to DFCO, the revs have to be above 1500, which takes considerable more energy than idling at 700. Sure, no fuel is being used during DFCO, but it still requires energy, which is provided by the kinetic energy of your coasting vehicle, which was previously provided by gasoline (accelerating up to speed). You can feel the energy loss - the way the vehicle decelerates quicker when you are in DFCO vs neutral coasting.

While it is neat to see DFCO appear on your ScanGauge, the general consensus around here is that if you want the most efficient coast, you do it in neutral, engine idling. Yes, it is still burning fuel, but your vehicle will coast much much further in neutral, and the engine will only need to turn at idle speed. And if the coast is timed correctly, it will actually provide a net savings over DFCO in the end.

Many like myself take it once step further will a kill switch. Long coasts with zero fuel make it even better!

and increase speed allowing a longer coast......
i have an Ultraguage, and love it. only way i am able to achieve the numbers i get. also, really easy to reset values after a fill up. and, cost 70.00 shipped.

[Cobb]

Yeah, every vehicle Ive driven the DFCO feature works at different rpms. For the insight its down to 0 rpms or auto stop. Most automatics like mentioned 1500 rpms. One nice thing about owning an sg2 and driving different vehicles.

What I like the best is the ability to scan codes and clear check engine lights.

Setting up cost per mile is the second best way to get dirty looks from your passengers vs not using the ac in the summer.

[H-Man]

Dirty looks because you are getting thrice the miles per dollar they get?

[Cobb]

No, dirty looks as they assume riding in a car was free and then you got a toll like device similar to a cab uses to tell em the fuel cost.

I got friends who think car ownership is free and all you got to do is pay for fuel. I tellem its a hell of a lot more expensive than that as you got taxes, fee, upkeep, maintenance too.

[Fat Charlie]

But it's just sitting there in the driveway, you might as well use it!