I was wondering, since the board computer shows current fuel consuption, when I remove my foot of the throttle pedal, the BC shows 0.0L/100km. Does that really means the consumption is zero at that point?

Yes, when you take your foot off the throttle, the injectors are closed completely and no fuel is injected.

Yes, when you take your foot off the throttle, the injectors are closed completely and no fuel is injected.

So how does the engine keep running then if it's using absolutely no fuel?

So how does the engine keep running then if it's using absolutely no fuel?

It's being driven by the roadwheels.

Edited 21 December, 201015 yr by rwbaldwin

I said that without moving my lips

It's being driven by the roadwheels.

What about when it's stationary then? An engine still uses fuel at tickover albeit a tiny amount.

When it's stationary and ticking over it uses fuel. When it's moving with your foot off the throttle, it doesn't use any.

When it's stationary and ticking over it uses fuel. When it's moving with your foot off the throttle, it doesn't use any.

OK, it's just that my trip computer tells me that the engine is using 0 fuel even when stationary - how so?

OK, it's just that my trip computer tells me that the engine is using 0 fuel even when stationary - how so?

Doesnt it say it is doing 0 mpg?

This one can catch you out!! I almost had a heart attack when I saw my little 1.2 was doing 16mpg, then I remembered I have been starting the engine and warming it up on the drive in all this snow..

Doesnt it say it is doing 0 mpg?

No, the display reads --- and doesn't start reading until I accelerate away in gear. If I put the transmission in neutral at any speed the display goes back to --- . Thoughts?

No, the display reads --- and doesn't start reading until I accelerate away in gear. If I put the transmission in neutral at any speed the display goes back to --- . Thoughts?

As the car is not moving it cannot cannot calculate a MPG figure. I suppose if you are moving but using absolutely no fuel (foot off the throttle) you are doing infinite MPG which it cannot calculate or if you are not moving but burning fuel (ticking over stationary) you are burning infinite gallons per mile!

If you put the car in neutral when moving it burns fuel as it's ticking over but the link to the speed must be somehow lost. Perhaps the sensor for the computer picks up in the gearbox somewhere it thinks the car isn't moving? Perhaps it thinks you shouldn't be moving in neutral? One for the techies I think

Edited 21 December, 201015 yr by Fatbloke

No, the display reads --- and doesn't start reading until I accelerate away in gear. If I put the transmission in neutral at any speed the display goes back to --- . Thoughts?

If you select the average consumption mode you can happily watch it tick down as you sit there idling. Your not going to get an instantaneous mpg because your not moving.

On mine it actually reads --- when the mpg goes over 200mpg instantaneous. If I listen carefully, as I slow down with the car in gear and no throttle I can hear the injectors kick in as it slows near to idle speed......

Edited 21 December, 201015 yr by raisbeck

What about when it's stationary then? An engine still uses fuel at tickover albeit a tiny amount.

Except for the Greenline II in stop start mode, where the engine completely cuts out and uses no fuel until you depress the clutch then the engine starts. The MPG shows ---. Skoda say stop start can save up to 7% fuel. The stop start feature is not automatic as in a hybrid, you have to basically be stopped and in neutral with the clutch up.

I suspect Fatbloke is right in there is a sensor in the gearbox to determine when the car is being driven and MPG can be calculated.