Hopefully someone can help out with this, I seem to have lost nearly 100miles per tank of diesel recently, the indicated MPG has stayed very close to what it’s always been and I normally get close to 500 miles per tank, however I’ve recently been getting no where near that, I’ve had a mate plug in his VAG DPF app and that didn’t show any issues with the DPF. Photo was taken when the fuel light came on which is normally close to 500miles, no signs of any leaks anywhere it just seem like diesel is disappearing! 

Carry on driving to 500 miles and beyond, if you run out of fuel you were right, if you dont then its become pessimistic after the change of government!

 

Are you refilling with the same quantity of diesel as before?

 

As an aside diesel here in France has been steadily coming down for several months, it always seems to happen after I fill up, its €1.58/litre at present, has it been coming down in the UK?

I posted a similar thread a short while ago, and got nowhere. I hope there is anyone out there who might know. On my car I've lost about 65-70 miles per tank which to me is also annoying.

The indicated mpg is staying virtually the same but the tank level is dropping faster - so doesn't that say the 'extra' diesel is not passing the monitoring points, so maybe leaking or evaporating?

 

It's not been hot enough for diesel evaporation to be a problem so my suggestion is to search for drips/leaks?

Edited 3 September, 20241 yr by PetrolDave

Speculation based on a belief in two dashboard indications which can vary in service so much that they are able to be adjusted via VCDS.

 

That is why I asked -

16 hours ago, J.R. said:

Are you refilling with the same quantity of diesel as before?

 

The tank size on a non-AWD Octavia is a nominal 50 litres, and that will be the minimum amount it holds.

If the 50 mpg displayed is reasonably accurate then 500 miles would use about 45 litres of fuel.

 

So as others have previously stated it really comes down to how much fuel you are putting in the tank (and distance covered) to work out whether your perception of reduced range is real or just as a result of change in the accuracy of the fuel gauge and it's now prompting you to refuel a little prematurely.

Put 46 litres after the fuel light came on, that was after covering just over 400 miles from a full tank.

 

I’m going to record everything over the next few tanks to make sure I’m not going mad! 

Edited 3 September, 20241 yr by Dan77

Is there not the traditional 7 litre "virtual" reserve in addition to the quoted 50 litres?

 

On all 3 of my Skodas I get around 5 litres more than the stated capacity on every tank fill by driving 50 miles or more beyond when it says zero miles remaining.

1 hour ago, J.R. said:

Is there not the traditional 7 litre "virtual" reserve in addition to the quoted 50 litres?

 

On all 3 of my Skodas I get around 5 litres more than the stated capacity on every tank fill by driving 50 miles or more beyond when it says zero miles remaining.

7 litres lmao what the hell. I've managed to squeeze in 1.5L above the 50L but 7L.... That's pretty hefty man.

 

My Octavia Scout 2016 has a 50L tank as well and I'm not really counting the 1.5L because I normally fill up right after the reserve light goes on.

 

I also only use my trip counter which I reset every fill up, and personally I've checked mileage over a 2 year period and 56.000km, so there should be more than enough data. I also see how much Litres I pour into the tank every time so it's got nothing to do with indicated mileage left and so on because I never use that. I look at the tank gauge and compare that to my trip counter as well as from time to time what amount of diesel has been poured in and so on.

59 minutes ago, Scout-MKIII said:

I've managed to squeeze in 1.5L above the 50L but 7L.... That's pretty hefty man.

 

Not hefty when you know what the capacities are and understand how the fuel gauge gradually starts telling lies once it gets beneath 1/2 a tank.

 

You know the miles remaining figure that shows just after you have filled up? The one that you think is optimistic as its 100 miles more than you ever get out of a tank and will get out of that one? That is the true range of a full tank if you use the whole capacity and its still a little pessimistic.

 

I had never known just how much I had remaining so on the first tank on my MK2 Octavia I ran it dry, it did 820 miles but I was driving for economy and the last afternoon was just driving around aimlessly waiting for it to run out.

1 hour ago, J.R. said:

 

Not hefty when you know what the capacities are and understand how the fuel gauge gradually starts telling lies once it gets beneath 1/2 a tank.

 

You know the miles remaining figure that shows just after you have filled up? The one that you think is optimistic as its 100 miles more than you ever get out of a tank and will get out of that one? That is the true range of a full tank if you use the whole capacity and its still a little pessimistic.

 

I had never known just how much I had remaining so on the first tank on my MK2 Octavia I ran it dry, it did 820 miles but I was driving for economy and the last afternoon was just driving around aimlessly waiting for it to run out.

I have no goal trying to drive till there's just fumes left. I fill up at the same spot everytime and I calculate range per Litres added each time and I've done this over 56.000km so as stated earlier I believe that's more than enough data. No need to empty the tank to measure fuelconsumption.

The given capacity of VAG fuel tanks are plucked out of the sky, without emptying the tank you have no way of knowing how much fuel it carries.

 

Mine is quoted at 65 litres and at zero miles remaining I can get 65 litres out of the pump, yet I have driven past this point on numerous occations so I know for sure there is 5-10 Litres left even beyond this.

6 minutes ago, SuperbTWM said:

The given capacity of VAG fuel tanks are plucked out of the sky, without emptying the tank you have no way of knowing how much fuel it carries.

 

Mine is quoted at 65 litres and at zero miles remaining I can get 65 litres out of the pump, yet I have driven past this point on numerous occations so I know for sure there is 5-10 Litres left even beyond this.

No need to empty the tank to measure fuelconsumption... You need amount of fuel used and what range has been driven.

Edited 3 September, 20241 yr by Scout-MKIII

1 minute ago, Scout-MKIII said:

No need to empty the tank to measure fuelconsumption...

Never suggested there was a need?

 

To be fair it was meant to be a replay to J.R rather than being directly related to your issue.

 

As i'm sure you are aware the car doesn't actually calcluate fuel consumption, it is a theoretical value, so the fact you are not going as far with the same fuel consumption means you are either missing some fuel or the car isn't correctly calculating the MPG and it sounds like you are going to start manually checking this so you should have your answer soon.

 

Have you checked your oil level recently to make sure its not getting dumped in there? I doubt it mind as you seem to be missing more than what would fit in your sump.

The tanks capacity is well known, that of a tank out of a car.

It is how much up the pipe, and venting that throws people.

Maybe an additional 7 liters or so, 

 

How many liters uses for miles or km driven is all that matters and if you know how much you fill up time after time you should know. 

17 minutes ago, SuperbTWM said:

Never suggested there was a need?

 

To be fair it was meant to be a replay to J.R rather than being directly related to your issue.

 

As i'm sure you are aware the car doesn't actually calcluate fuel consumption, it is a theoretical value, so the fact you are not going as far with the same fuel consumption means you are either missing some fuel or the car isn't correctly calculating the MPG and it sounds like you are going to start manually checking this so you should have your answer soon.

 

Have you checked your oil level recently to make sure its not getting dumped in there? I doubt it mind as you seem to be missing more than what would fit in your sump.

The topic of this thread started by Dan77 is fuelconsumption, so there's no need to repeat things that will just be a detour.

 

Then you are just repeating more information that will just be a detour. The car not calculating MPG correctly(The car doesn't do it. I do it. I'm a humanbeing who can use my head to calculate as well as pressing keys on a calculator) You'd know this if you had read what I've already have written.

 

Then you ask if I've checked my oil level recently, completely oblivious to the fact I stated I've driven 56.000km over 2 years which should tell a thing or two about that as well.

 

It would be nice if people who actually want to help someone actually read the provided information, so all these detours would not surface all the time(Same thing happened in my thread...).

50 mpg at an average speed of 36mph sounds good to me?

38 minutes ago, Scout-MKIII said:

 

 

It would be nice if people who actually want to help someone actually read the provided information, so all these detours would not surface all the time(Same thing happened in my thread...).

 

I did actually think you where the OP, but this this isn't even the thread you created, you've just hijacked it. We have 2 lots of information on a similar issue and you are moaning about clarification???

 

And as another person berated for -

11 hours ago, Scout-MKIII said:

No need to empty the tank to measure fuelconsumption.

 

I do not run my tank as low as I do to measure my fuel consumption I do it because I dont want to fill the tank up 5 times when I can do so 4 times, no point for me in driving around with a 60 litre fuel tank and only using 50 of them or less than 45 if you refill when the fuel warning light comes on, others prefer to feel secure and I understand that.

 

As ScoutMKIII has become adversarial I wont contribute any more and wish him well finding the cause of his increased fuel consumption.

 

10 hours ago, Ootohere said:

The tanks capacity is well known, that of a tank out of a car.

It is how much up the pipe, and venting that throws people.

Maybe an additional 7 liters or so, 

 

Nowhere near 7 litres volume in the filler the true volume of the tank does not include overfilling, Skoda used to quote the true tank volume with the "reserve capacity" shown in brackets, it looks like at some stage they stopped doing so and only quote the net capacity, I wonder if it is yet some more kidology because of WT whatever (I wanted to say WTF!) requirements, gaming the system to get a lower emissions rating?

 

Do they perhaps call it "refill" capacity?

Well with 45 litre Fabia MK2 tanks you could get in over 50 litres and see the petrol and then vent it and get more in. So as it is. Different strokes for different folks in different models.   As it is a driver with a daily driver should pretty much know about their car.  If paying attention. 

13 hours ago, SuperbTWM said:

The given capacity of VAG fuel tanks are plucked out of the sky, without emptying the tank you have no way of knowing how much fuel it carries.

 

Mine is quoted at 65 litres and at zero miles remaining I can get 65 litres out of the pump, yet I have driven past this point on numerous occations so I know for sure there is 5-10 Litres left even beyond this.

 

I have seen stats for the Passat at 18.5 Gallons capacity

 

Given the BS about "balanced gas mileage" that will be US and not imperial gallons.

2 hours ago, J.R. said:

Given the BS about "balanced gas mileage" that will be US and not imperial gallons.

 

 

70 litres?

A little bit less of the top of my head.

 

How did the thread deviate to the fuel capacity of an American Passat? 😀