Technical Instantaneous Comsuption Data Correct?

[opensea]

I bought a second hand 2005 Fiat Stilo 1.6 16v.

I am very experienced in automobile mechanics. As far as i observed till now, this car is consuming too much fuel.

In city, average consumption is at around 11lt/100km. The air filter, spark plugs etc are replaced.

But when i look avg. consumption, 8.5lt/100km is seen. Can the difference between real and on board values be so big?

Also when i take my right foot from the gas pedal while the car is going, (the gear is not in neutral) instantaneous consumption is read as 2lt-2.5lt/100km unlike the usual cars 0lt/100km. Do you observe same reading? Or does it indicate any problem in my car?

 

[opensea]

No reply yet

What did you see on board computer (inst. mode) when you lift your foot the accelerator?

 

[OzMoSiS]

as long as the car is moving, you will never see 0lt.

i cant be bothered to convert between lt/km and mpg, but your values look ok.

in instant mpg i can see upto 80 or 90, yet actual consumption can be around 50.

there are a lot of factors that account into this. instant consumption is nothing more than a guide to help you drive more economically

 

[Argonought]

as long as the car is moving, you will never see 0lt.

On a JTD going down hill the consumption is zero since all injectors will be shut off (I think the same may apply to the 1.6)

Thus you actually use LESS fuel when in gear than if coasting down in neutral

Fairly easy to get 99.9 mpg if you reset trip 'B' at top of hill so would imagine same applies to instant - but no idea what it shows in metric units :chin:

 

[opensea]

On a JTD going down hill the consumption is zero since all injectors will be shut off (I think the same may apply to the 1.6)
:chin:

This is what i expect from my car too. But i never see 0lt/100km at inst. mode.

Since i live in a country where metric units are valid, I set my car's computer to metric.

:idea: but here a new idea raised. I have a clue;

Most probably, since two different units can be set, there must be an algorithm to convert mpg to lt/100km in computer of car. And 0lt/100km is equal to infinite mpg and you can not show it on display.

99.9mpg stands for 2.6lt/100km and this is the value that i observe on board when i lift of my right foot..

 

[OzMoSiS]

99.9 is the max that the computer can show, and your findings mean your car is fine

as i said, the inst consumption is more of an indicator to make you drive better than anything else

 

[A3jeroen]

There is a built in delay in the displaying of the consumption. Otherwise it would go up and down so fast you couldn't read it.

gr J