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I ran my hdi soo low the needle didn't even go into the red on many occasions and only cut out once :p mine also lit eml for afew days
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Bit wank that from the french
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2 can play at this game
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Tom's right, they cut off completely in higher gears on the hdi.
But that still doesn't make it 0 mpg, quite the reverse haha!
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(17-04-2013, 06:54 PM)Poodle Wrote: Tom's right, they cut off completely in higher gears on the hdi.
But that still doesn't make it 0 mpg, quite the reverse haha!
No it really IS 0 mpg if you think about it. Yes you're covering miles, but you're using zero gallons - zero multiplied by anything will still be zero. Or have I got my maths wrong?
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17-04-2013, 07:56 PM
(This post was last modified: 17-04-2013, 07:58 PM by Curt.)
Yes, you have got it wrong... it'd be 0GPM
Oh and I ran out twice in my DT, it used to run out on a 1/4. Had my Audi reading 0 miles left twice too, made it though
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It makes no difference surely?
Say you coast for 2 miles (long hill lol) 0gallons/2miles is still 0mpg. 
Whats odd with the Vec is it changes to gph under 8MPH - Gallon per hour lol......which is 0.1 while idling usually.
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No because for however long it is, you'll be doing, say, 80mpg. So for those 2 miles, you've saved a small amount of fuel. 0MPG is if you'd made no progress at all. Come on Tom, I thought you were the MPG expert? 
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(17-04-2013, 04:52 PM)ginge191 Wrote: 2 can play at this game
Hahaha! Was that today?
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No tom because the engine still uses fuel to idle. Thats why its actually more economical to stay in gear with your foot off the throttle if the momentum will keep you at the speed you want. because the management usually cuts all fuel when in gear but 0 throttle.
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How can it be 80mpg?
We need some maths experts here - zero multiplied or divided by ANYTHING is still zero. You're using zero fuel, so 0mpg!
You could have a 500 mile hill and still do 0mpg as you wouldnt use any fuel at all...0 gallons!
Its not so difficult lol. 
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But for the purpose to accurately work out fuel consumption, it would have to be 0MPG, rather than the 99999999.9999MPG the scanguage shows?
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17-04-2013, 08:13 PM
(This post was last modified: 17-04-2013, 08:13 PM by Toms306.)
(17-04-2013, 08:10 PM)Niall Wrote: No tom because the engine still uses fuel to idle. Thats why its actually more economical to stay in gear with your foot off the throttle if the momentum will keep you at the speed you want. because the management usually cuts all fuel when in gear but 0 throttle.
Err, thats what we're talking about Niall, keep up! The injectors shut off if you're over about 1500rpm with no throttle.
It'll be using no fuel at all at that point.
(17-04-2013, 08:12 PM)callumcull Wrote: But for the purpose to accurately work out fuel consumption, it would have to be 0MPG, rather than the 99999999.9999MPG the scanguage shows?
Finally!  Someone gets it lol.
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oh my bad!
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17-04-2013, 08:15 PM
(This post was last modified: 17-04-2013, 08:15 PM by callumcull.)
Do the injectors really cut off below 1500, the scanguage still displays 999.99 with no throttle under 1500?
(17-04-2013, 08:13 PM)Toms306 Wrote: (17-04-2013, 08:10 PM)Niall Wrote: No tom because the engine still uses fuel to idle. Thats why its actually more economical to stay in gear with your foot off the throttle if the momentum will keep you at the speed you want. because the management usually cuts all fuel when in gear but 0 throttle.
Err, thats what we're talking about Niall, keep up! The injectors shut off if you're over about 1500rpm with no throttle.
It'll be using no fuel at all at that point.
(17-04-2013, 08:12 PM)callumcull Wrote: But for the purpose to accurately work out fuel consumption, it would have to be 0MPG, rather than the 99999999.9999MPG the scanguage shows?
Finally! Someone gets it lol.
Ha, win!
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(17-04-2013, 08:15 PM)callumcull Wrote: Do the injectors really cut off below 1500, the scanguage still displays 999.99 with no throttle under 1500?
It might be down to like 1100rpm in the HDi, I never had a scanguage so couldn't say.
BUT if it goes down low enough to be governed then obviously it'll start using fuel again.
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Yeah for sure!
Don't buy one, you'll stop being arsed to enter numbers in it every time you stop for fuel.
On the other hand, it is very handy for reading and clearing fault codes and engine temps!!
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Nah I don't want a scanguage anyway lol. And I can clear codes or read data with my fault code reader anyway.
Fed up with the Vectra on borad computer though, the mpg is totally wrong! So I've still gotta work it out manually anyway haha. Shoulda stuck with the Golf, the mpg on that was max of 1mpg out either way!
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But it won't be using no fuel, just very little. So you will still have an 'MPG' figure. But, my point is, even if for arguments sake it was using NO fuel... it would be zero gallons per mile. You're still making progress, just not using any fuel...
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How will it be using fuel, wheres it going? Yes the HP pump is still keeping pressure, but until the injector solenoid is operated it won't inject any fuel into the cylinder. It doesn't need to, fuel is only there to keep the engine turning above its mechanical losses (800rpm say)....if you're above those losses with gravity, momentum and the wheels turning the engine (via the 'box obv) why would you need any fuel in there?
But I still can't see how makes a difference whether its GPM or MPG. I'll take you're word for that though.
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(17-04-2013, 08:33 PM)Toms306 Wrote: How will it be using fuel, wheres it going? Yes the HP pump is still keeping pressure, but until the injector solenoid is operated it won't inject any fuel into the cylinder. It doesn't need to, fuel is only there to keep the engine turning above its mechanical losses (800rpm say)....if you're above those losses with gravity, momentum and the wheels turning the engine (via the 'box obv) why would you need any fuel in there?
But I still can't see how makes a difference whether its GPM or MPG. I'll take you're word for that though.
I'm with Tom on this!
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It'll be using no fuel, that's right. But if it's using no fuel, it'll be getting infinite miles to the gallon, not 0.
MPG = miles/gallons
Anything divided by zero equals infinity.
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This^, thank you Alex.
I don't know the ins-and-outs of the modern diesel engine, thought it must be using a small amount of fuel hence there would be a figure... but yeah, that's what I was meaning.
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Tbh this is a bit of a silly argument anyway because the MPG displays in even the most modern cars dont take a lot of things into account like idling at a stand still or stop start.
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Mine was more an argument of common sense than anything
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(17-04-2013, 09:15 PM)Curt Wrote: Mine was more an argument of common sense than anything
Thats true but then again toms involved so i give it another 8 posts before it is about mpg and not if coasting is infinite mpg or 0 mpg lol
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Toms floating down bypasses in neutral videoing his mpg gauge as we speak.....
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No no no, in gear, he'll tell you off for that
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New astra I had said 0.7 gal/hr when idling, sitting in traffic ect. But if accelerating would go to mpg.
so it would be 0 mpg when idling or coasting ect, even though you could travel 2 miles coasting,
So in theory if you travelled at 60mph and coasted 60 miles you would do 86mpg roughly on that astra.
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