Short term memory

[sentiMENTL]

Is there a time limit for short term memory resetting itself?

I'd have thought once a day automatically but it seems to be every few hours between using the car.

Is that right?


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[Guest 2]

2 hours of ignition off it resets.

[sentiMENTL]

Really ?

I'm sure I've driven to work in the morning, spent at least 7 hours there and gone to drive home and it's not reset.

At least I know now.

Thanks


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[Guest 2]

Any Audi model and other VAGs I've driven over the years including my A3, my old A6 and now new A4 all reset after 2 hours of standing.

Initially before you move off again it will stay at the previous figures but once you start driving it reverts back to 0.0mpg etc.

Think the long term computer '2' resets after 10,000 miles but rarely look at it.

[MarkTM]

Think the long term computer '2' resets after 10,000 miles but rarely look at it.

Anyone know if this is true? When I bought my C6 in 2012 the DIS 2 for MPG stated 33.4. 3yrs and 36k later it's running at 39.1, never once saw a dramatic jump just gradual increases over the years in 0.2 or 0.3 increments.

I do know that the 'max range' reading on my C6 only goes up to 1015 miles...after then I can hear the ECU screaming "You cannot be serious with a 3.0 V6!" :biglaugh:

[robes401]

My long term is still going and not reset itself in 26,000 miles and just over 12 months... 2014 A6 ultra.

[belly buster]

My A4 reset after about 10k miles, but the A6 hasn't yet reset after 35,000 miles.

[IsDon]

I reset my long term after each fuel fill. I can then check distance driven against consumption to see how much fuel should fill the tank.

I have twice caught service stations with incorrectly calibrated bowsers. In their favour of course. The worst was over reading by 11%. That's 11% overcharging. A big fine from the regulator wiped the smile off his face.

Make use of your long term computer. It may save you being ripped off.

[MarkTM]

A trying to make sense of the last post, mainly because if you rely on the pump cut of on fill, how can you be sure they are have their cut-offs all calibrated the same? I'd imagine there could be quite a void between them and it wouldn't be a legally or regulatory enforceable issue (i.e. trading standards as am not quite sure of any 'regulator').

So I rely on filling the car and then topping up with a jerry can(s) so that it has filled the neck and fuel is visible at each fill, Indeed, typically I always buy 100l* of fuel so that my long term calculation is far more accurate on how far the full 100l actually took me :D Have also deduced that inc. the filler neck my tank will hold 85l when the tank is rated as 80 (circa 6% difference)!

*Coincidentally the same amount that most fuel vouchers allow.:biglaugh:

[Q7quattro]

I reset my long term after each fuel fill. I can then check distance driven against consumption to see how much fuel should fill the tank.

I have twice caught service stations with incorrectly calibrated bowsers. In their favour of course. The worst was over reading by 11%. That's 11% overcharging. A big fine from the regulator wiped the smile off his face.

Make use of your long term computer. It may save you being ripped off.


it didn't even occur to me to do that- I will be doing it in future ......ok from now on maybe we should all do this (those with affected engines) and take a photo with the date on the screen .......so when the "emissions" fix is carried out , be interesting to compare.

[fest0r]

Not sure if I’m missing something, but I use a fuel log app (loads available) and enter the amount, price and mileage each fill up. It gives you the actual mpg and doesn’t rely on the generous guesstimates from the car.

I would guess any filling station overcharging/undersupplying by 11% has a genuinely faulty pump or is a fairly desperate independent. Maybe I’m just a tight Scotsman, but I would notice an extra 11% without checking my OBC :biglaugh:

Might be different with all the cutbacks, but Trading Standards used to test pumps every 6 months and were also required to commission new installs etc. My local Shell has their stickers on each pump.

[IsDon]

A trying to make sense of the last post, mainly because if you rely on the pump cut of on fill, how can you be sure they are have their cut-offs all calibrated the same? I'd imagine there could be quite a void between them and it wouldn't be a legally or regulatory enforceable issue (i.e. trading standards as am not quite sure of any 'regulator').

So I rely on filling the car and then topping up with a jerry can(s) so that it has filled the neck and fuel is visible at each fill, Indeed, typically I always buy 100l* of fuel so that my long term calculation is far more accurate on how far the full 100l actually took me :D Have also deduced that inc. the filler neck my tank will hold 85l when the tank is rated as 80 (circa 6% difference)!

*Coincidentally the same amount that most fuel vouchers allow.:biglaugh:

The cutout between pumps will vary by 1 litre max, and I, like you, fill to visible fuel in the neck at each fill.

I have also found the mpg calculated by the car computer to be spot on. Check it against your own log if you like. It may not be the same as the quoted mpg figure in the glossy brochure but it is accurate against your actual real world conditions.

In 99.99% of fills I've found the fill amount to be within a litre of the amount calculated from the computer. So when it's out by 11% I notice.

There is a department within government responsible for calibrating weights and measures. When I contacted them, they did a spot check on the pump and found it was indeed over reading by 11%. Most other pumps in the same garage were also rigged to over read by between 6 an 12%. They missed one which was actually accurate. No doubt this was an attempted fraud by the garage concerned. The garage now has a new owner.

Of course my method is not legally enforceable. But it did point the regulator to the problem which they addressed with gusto.

Yes an 80 litre tank is 80 litres, plus the associated plumbing. If you fill to the same point each time I find it difficult to understand how you think this is going to affect the result. Maybe you're just a little slow.

[MarkTM]

With OEM (245.40. 18) wheels on my C6 my DIS and speedo typically read +5%, however with 245/45/18's speedo and MPG read no more than 1% out.

I think true accuracy only comes from a VCDS scan, which will always be slightly less than your odometer reading, I figure there must be an ECU calculation going on to give the true figure?

I've never been able to fill to brim at the pump without spilling some, even when I top up with a jerry can it takes 4l more after tank settling/air traps etc. When I've attempted this level of slow feed accuracy at the pump the fuel feed invariably times out.

Well done in getting the 11% sorted, am guessing it was an independent garage rather than a chain/supermarket?

[IsDon]

With OEM (245.40. 18) wheels on my C6 my DIS and speedo typically read +5%, however with 245/45/18's speedo and MPG read no more than 1% out.

I think true accuracy only comes from a VCDS scan, which will always be slightly less than your odometer reading, I figure there must be an ECU calculation going on to give the true figure?

I've never been able to fill to brim at the pump without spilling some, even when I top up with a jerry can it takes 4l more after tank settling/air traps etc. When I've attempted this level of slow feed accuracy at the pump the fuel feed invariably times out.

Well done in getting the 11% sorted, am guessing it was an independent garage rather than a chain/supermarket?

It was not an independent. It was a large chain. They are franchises though. This was a dodgy, although not very smart, franchisee.

I suspect his head office would eventually start asking questions when it became obvious he was selling more fuel than was being delivered to him.

[johnsimcox]

My A4 reset after about 10k miles, but the A6 hasn't yet reset after 35,000 miles.
I recall reading somewhere else that the figures , such as consumption etc are an average of the last 10k miles, unless of course you reset it

[MarkTM]

I recall reading somewhere else that the figures , such as consumption etc are an average of the last 10k miles

That's the problem, everyone remembers reading it but know one can point towards an authoritative reference document, I even asked Audi UK and they said they couldn't find anything (or more likely couldn't be bothered looking).

[Scott K]

On my car, the long term memory tells you how many hours it has been and the average speed as well as the long term mpg. I think it is not limited to 10k miles.

[Chesterfield313]

Mine is still going at 31,000 miles. I don't believe it is hugely accurate though. On one recent 200 mile trip, where I averaged 5 mpg better than the long term, it improved the long term my 0.5 mpg. That cannot be correct, my rather basic maths says it should only improve it by 0.03 mpg.

[MarkTM]

^^^Unless of course it resets but leaves the previous cycle average in place, in your case just before you did your 200 mile trip?