Driver Profile Selection - Coasting Function

[danielb_c]

4. And this is a big one - When you de-clutch, you are still burning fuel to keep the engine idle. So while in normal mode, you burn 0 fuel rolling to a stop, in ECO, you actually burn fuel while your car is coasting. This is fine if you have the luxury of rolling for a long time so your fuel usage is offset by your rolling distance. However, in city conditions, you generally roll for a small distance, only to have to brake (usually harder to compensate for your faster rolling speed in ECO) to stop, in this case, you are not really saving any fuel.

What makes you think coasting with clutches disengaged would use any more fuel than rolling to a stop in gear? The engine is still turning over, spark plugs firing, energy is still needed to run your other systems. With all due respect, just because your dash is telling you you're using NIL fuel, doesn't mean it's true.

If anything you should be using less fuel while coasting because the RPM is lower than when in gear, and there's no load.

Giving yourself more distance to the car in front improves efficiency (Eco mode or otherwise) because you're not having to brake as often, therefore you're also not having to accelerate as often. Hence why cars with ACC have a larger gap to the car in front in Eco mode than in other modes.

[agentthumb]

Driver Profile Selection - Coasting Function

What makes you think coasting with clutches disengaged would use any more fuel than rolling to a stop in gear? The engine is still turning over, spark plugs firing, energy is still needed to run your other systems. With all due respect, just because your dash is telling you you're using NIL fuel, doesn't mean it's true.

If anything you should be using less fuel while coasting because the RPM is lower than when in gear, and there's no load.

Giving yourself more distance to the car in front improves efficiency (Eco mode or otherwise) because you're not having to brake as often, therefore you're also not having to accelerate as often. Hence why cars with ACC have a larger gap to the car in front in Eco mode than in other modes.

Refer to discussion here. Please explain how my car uses NO fuel while in gear coasting downhill?? - TDIClub Forums

Also, I have ACC. Eco makes no difference to ACC distance. The two are independent. It may appear so because ACC is slow as hell when in Eco, which I set in individual mode. This takes advantage of the slow response, but coasting feature doesn't activate when set in individual mode. Perfect when using ACC to crawl in traffic.


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[danielb_c]

Refer to discussion here. Please explain how my car uses NO fuel while in gear coasting downhill?? - TDIClub Forums

Also, I have ACC. Eco makes no difference to ACC distance. The two are independent. It may appear so because ACC is slow as hell when in Eco, which I set in individual mode. This takes advantage of the slow response, but coasting feature doesn't activate when set in individual mode. Perfect when using ACC to crawl in traffic.


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The link in the thread appears broken, but after my own Google search I do stand corrected good sir! Thanks for pointing me in the right direction.

FYI: Coasting in Neutral or Gear to Save Gas - Coasting and Fuel Economy

The challenge I would have to this, however, is it assumes there is zero throttle input in both scenarios. Where the hill is not a significant grade, being in gear may actually require you to use some throttle to maintain a constant speed due to the drag the drivetrain creates, and therefore you would use some fuel, whereas coasting would likely be longer before a throttle input is required. Which one is more, I don't know, but I'm sure someone out there has tested it.

I, personally, get the best fuel economy when there's no traffic, because I'm not having to adjust speed because of the person in front's inability to maintain a constant speed, and also I can allow the car's speed to fluctuate a little with the undulations (letting off the accelerator early over the crest of a hill, or allowing it to go a little over the speed limit down a hill when there's an uphill coming, etc)

[agentthumb]

Driver Profile Selection - Coasting Function

The link in the thread appears broken, but after my own Google search I do stand corrected good sir! Thanks for pointing me in the right direction.

FYI: Coasting in Neutral or Gear to Save Gas - Coasting and Fuel Economy

The challenge I would have to this, however, is it assumes there is zero throttle input in both scenarios. Where the hill is not a significant grade, being in gear may actually require you to use some throttle to maintain a constant speed due to the drag the drivetrain creates, and therefore you would use some fuel, whereas coasting would likely be longer before a throttle input is required. Which one is more, I don't know, but I'm sure someone out there has tested it.

I, personally, get the best fuel economy when there's no traffic, because I'm not having to adjust speed because of the person in front's inability to maintain a constant speed, and also I can allow the car's speed to fluctuate a little with the undulations (letting off the accelerator early over the crest of a hill, or allowing it to go a little over the speed limit down a hill when there's an uphill coming, etc)

No problem

And hence my argument that it will save you fuel out in Rural areas where you have the luxury of coasting for great distances, but not so good in city traffic where you are making constant adjustments.


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