Did a 110 mile trip today - no problem, but for once had a look at the fuel log info. The daily journey figure was 46.7 mpg (1)

whereas the average figure (2) showed 55.9 mpg !!!!!! :no:

No way can this be right - so a journey to the dealer will have to be made.

Has anyone else had this obvious error on their motor?

Engine? Mileage? Year?

I can't see on mobile version of the site :(

1.2 TSI - 86. Year 2013 - 9000 miles

Maybe not that wrong if you zeroed the computer before the trip.

 

If daily day and over an extended time you get averages showing 46.7 mpg,

  you are often only getting 30-35 mpg,

even less than 30 on a trip of a couple of miles.

 

Averages are just that, so if you get 30 miles from a gallon,  you must get 60 miles or so at other longer trips maybe at 50 mph.

So getting 55.9 mpg average on a longer trip with the engine up to heat and the good driving conditions is perfectly normal.

Maybe on the next similar trip brim it before and after and see if you are doing 110 miles and using under 2 gallons. (2 x 4.546 litres)

Sorry George cannot go along with your reasoning on this one - (have I missed a relevant point somehow?)

 

Let's assume that the daily / individual journey recording is accurate, and note that at the very best my journey mpg indication  never exceeds 46 mpg.

On this basis alone I cannot see that an average figure can exceed the daily/journey figure - the average being based somewhere between the highest and lowest figure from the ongoing  daily/journey figures.

 

In my old age, perhaps I am missing the point your are making in some way?

I see what you're saying George.

But I'm still confused. Have you got the 1 and 2 trips mixed up?

The 2 is the one that (you can reset, but usually leave it be) and is averaged over the last few thousand miles iirc.

1 is the daily trip one which resets if the ignition is off for 2 hours.

2 could only be averaging 55.9 if he's been exceeding it massively at some points to bring the average up that high.

With a trip (say that's a fuel efficient trip) of 46.7mpg as the 'usual'. The 2 can't be right can it.

Unless the OP has been spending a lot of time going down big hills over the last few thousand miles, i don't see how it can be correct in a 1.2 tsi

The point is many people leave the long term average un zeroed and they have not had 46.7 miles as an average from all the gallons of petrol they used.

 

What matters really is, on the trip how much petrol was used.

If you zero Trip 1 & Trip 2 and fill the tank, and then fill again next week will you have actually got 46.7 miles from each gallon used.?

 

The computer is not working under any exact science, and it is going to be rather difficult to get any technician to correct if faulty without now seeing how accurate or inaccurate its calculations are.

So maybe brim the tank, Zero Miles, Average Miles on 1 & 2 Settings, and see the Average over this tank full,

and on a trip see the average that registers.

Then you will get an idea of indicated fuel use and actual.

 

 

You can get very high settings on '2' for a while after a Zero,  then a low Average, and the '2' average will obviously drop,

but equally as you do a journey the Average might not show high all the trip, but you can get a Higher Average on setting '2' once stopped 

because the car was using fuel economically .

Edited 10 June, 201511 yr by goneoffSKi

Keep track on Fuelly (see sig) for a few fill-ups 

 

My Maxi-Dot will sometimes be a little reserved and other times very over the top with it's MPG figures. But Fuelly does it on the Fuel in and Fuel out compared to the miles covered!!

Again George, cannot agree with you at all - another poster has rightly made the point in a very clear way by saying " -

 

"The (2) is the one that (you can reset, but usually leave it be) and is averaged over the last few thousand miles iirc.

(1) is the daily trip one which resets if the ignition is off for 2 hours.

2 could only be averaging 55.9 if he's been exceeding it massively at some points to bring the average up that high.

With a trip (say that's a fuel efficient trip) of 46.7mpg as the 'usual'. Then 2 can't be right can it.

Unless the OP has been spending a lot of time going down big hills over the last few thousand miles, i don't see how it can be correct in a 1.2 tsi."

 

I have no wish to pursue this to a points scoring end, so will gracefully  bow out at this stage. My thanks to those who have commented, and I will be interested in any further comments that may be made.

PS - at no time have I zero'd  1 or 2 whilst on the move.

 

 

Edited 10 June, 201511 yr by 2ndskoda

?

So what was Average '2' showing before the journey, did you look & was it 46.7 mpg or there about from daily drives,

much as '1' was showing ?

Or did you only check after the journey.

 

.......................................

No idea what servicing you have done already, 

but @ 9,000 miles hopefully your fuel consumption improves noticably, sometimes it is after the first oil change where it gets done on fixed annual servicing,

the factory oil often does not give the best economy.

Edited 10 June, 201511 yr by goneoffSKi

Looking at it a slightly different way, do you know how accurate the Trip 1 46.7 mpg figure is? 

 

I would brim the tank, undertake a similar journey, then brim the tank again. You can then get a clear picture of how accurate the trip computer is.

 

The accuracy can be adjusted, definitely with VCDS as I've done it on many Skodas, or possibly with VAS if you want to visit a dealer. My last Octavia was 13% optimistic for example, so I adjusted that to more closely match my brim-to-brim figures.

 

Only then would I look to see if there's another accuracy issue, between Trip 1 and Trip 2. Although my gut feeling is your issue lies with overall trip computer accuracy. 

I've never even looked at the average '2'!

Do you get to it by pressing/holding in the little button underneath the stalk?

2ndskoda, george is probably right. I've never ever seen a faulty trip computer when customers have complained about just this sort of thing. Doesn't mean yours in not faulty but it's highly unlikely. You can easily test it by brimming the tank as george is saying. Start with zeroed mpg trips. Then just compare them at the end of a journey or over time. Rememeber one of the trip meters does zero itself after two hours of standing with the engine off. I still wonder if you are getting confused by the two different meters. You wouldn't be the first. Leaving the trip 'unzeroed' is the best way to get an average but it can vary considerably to the individual journey mpg by quite a bit and it CAN go either way. It depends on the journey's involved and the way you are using your meters. It doesn't necessarily mean that you have to achieve a much bigger figure on the long term average than the individual journey recording of the mpg either. It just depends how you have used the trips overall. I've had the same in my tiptronic auto 1.6 with the average working out higher than the individual journey mpg. Ulitimately, we cannot possibly know what is right for you and your car because we don't know how the car is driven and on what road in what conditions, and how you are using your meters. I really doubt if anything is wrong but let us know if something is found. Cheers!

Edit: just realised you must be getting confused (no offence) for sure. I reckon the meter that resets itself after two hours is showing a high average for just one journey where you achieved a good run with good mpg (obviously). But your '2' meter was showing the average for the last few days or whatever which would be a lower figure for several journeys or whatever. The difference can be considerable. Of course the only other readout regarding mpg's is the 'instantaneous' readout which is not what we are talking about.

Edited 11 June, 201511 yr by Estate Man

Just completed 150 mile trip this morning.

Cruise Control on at 70 mph and between 42-46 mpg once warmed up for about 140 miles.

Both '1' and '2' reading the under 50 mpg figure, and the last 1 mile to home through the 30 mph limit and when stopped at home & over 50 mpg showing on avarage '2'.

(just away to check the camera to see just what shows.)

 

Edit.

Does my bum look big.?

(pretty though)

Edited 11 June, 201511 yr by goneoffSKi

Guys this post is getting a bit silly! - I was not going to comment further, however this needs to be said.

 

It would seem that no one is reading what I have actually said correctly (with the exception of just one poster) - And I assure you all that I know what the function of fuel (1) is, and also the function of fuel (2).

If I may quote estate man -

 

"Edit: just realised you must be getting confused (no offence) for sure. I reckon the meter that resets itself after two hours is showing a high average for just one journey where you achieved a good run with good mpg (obviously). But your '2' meter was showing the average for the last few days or whatever which would be a lower figure for several journeys or whatever."

 

You have totally misunderstood what I have said - I reported that my average figure shown in figure (2) which I tend not to zero for several weeks, far exceeded that shown in fuel (1)

I further stated that at no time has my fuel figure in (1) been better that 45/46 mpg - it follows that the much higher figure in fuel (2) supposedly the average figure over a period of time cannot be correct!

 

Lets be clear what an average figure is - best perhaps explained in this way - a number obtained by adding several quantities together and dividing the total by the number of quantities.

If we total say 6 numbers :-    as an example  39+ 43+ 37+ 48+ 56+ 58+  total is 281 which we then divide by 6 which gives us an average of 46.83.

An average figure can never exceed even the highest shown figure in a series of numbers.

 

Using the 6 random figures I have used as the supposed mpg recorded on 6 consecutive occasions, it will be seen that the average cannot exceed the best daily figure shown in the example. Use your own set of figures and you will come to the same conclusion.

It was for this reason alone that I questioned the accuracy of the reading achieved in fuel (2).

I do hope this clarifies the matter a little clearer - if you read the very first post again, it really could not be clearer.

Anyway Chaps, no offence intended to any of you posters who have been kind enough to comment. We all view things in different ways.

Cheers for now

You haven't addressed the (potential) accuracy issue though.....

 

Which would affect both Trip1 and Trip2.

No idea about your 110 mile run, road type or speed,

 but is near 56 MPG shown not possible for the trip, 2 gallons on petrol used for the journey ?

Wardy

the point you make is of course a good one

 

"You haven't addressed the (potential) accuracy issue though.....Which would affect both Trip1 and Trip2."

 

The outcome of this suggested action will of course confirm the inaccuracy of one or both readouts - so as reported at the very start, the readings are inaccurate!.

Could you just answer, have you ever achieved an indicated 56 mpg or more over a distance, say at a constant 60 mph?

 

They do get that sort of economy.

What you haven't checked or mentioned is over how many miles trip 2 was over. It resets itself after 2000 miles so it's possible that part way through your journey it reset and for that part of the journey you got higher figures than the whole of trip 1.

Phil

Phil-E

That is a very interesting point that you make Phil-E.

 

I certainly did not know that (and I suspect that not many people do) - it does raise interesting possibilities!

I have today zero'd everything, so will see how it all pans out. Will be on holiday Next week, so will be doing a fair mileage.

 

"It resets itself after 2000 miles" - thanks again for the info

Edited 11 June, 201511 yr by 2ndskoda

Page 19 of the 2010 Fabia Owners Manual.

Multi-function indicator (onboard computer)

Total trip Memory (memory 2)

 

'The total distance driven memory gathers data from a number of individual journeys up to a total of 19 hours and 59 minutes driving 

or 1,999 kilometers driven and on vehicles which are fitted with the display* up to a total of 99 hours and 59 minutes driving

or 9,999 kilometers driven.

The memory is deleted when either of these limits is reached and the calculation starts from anew.'

 

** So 1,241 miles

or 6,213 miles**

Edited 11 June, 201511 yr by goneoffSKi

Yep, 2ndskoda, sorry I got the figs the wrong way round. But, it is not inevitable that the average Trip 2 fig is always going to be lower than Trip 1 and that is normal for some driving conditions. The figure on trip 1 can be lower than the average figure in trip 2. Trip 1 will have reset itself of course so would in effect record a single trips worth of average mileage where your consumption of fuel was obviously higher for whatever reasons (lower fig showing in the trip 1) than the average in Trip 2. The average in Trip 2 may not have varied much in each trip that you did recently so has given you a good figure. It's happened to me just that way and it happens to most folks like that periodically it's just most folks don't check the Trips like you have. I'm certain you don't have anything wrong, the average in Trip 2 can be higher than Trip 1 and that's perfectly normal under some circumstances. Think about it. Your maths are ignoring the fact that Trip 1 resets and works independently to provide a singe journey average which can be higher or lower than the average for several trips in Trip 2. Phil and goneoffSki are correct too in what they are saying and that may also have played a part or be the whole story. Sorry labouring the point but you get what I mean, I hope.

If my Yeti 1.2TSI 105 ever achieves 46.7mpg I will be over the moon. :(