Hi, I have a Skoda Octavia 1.9TDI 08 plate. When I first brought it, it seemed to be really good on fuel and then the "estimated miles" display seemed to go down pretty quickly, especially up hills. I've replaced the air filter, fuel filter, the cambelt and water pump.. I've even ran diesel cleaner through it. It seems to be as soon as there's any acceleration is just starts drinking fuel. 

 

I did a 50 miles journey today and used 70 miles of fuel to get there. What could be the issue? 

4 hours ago, Apollyon001 said:

I've even ran snake oil through it.

Correction and possible explanation inline, italic.

 

More seriously, it's a weighted average figure that places more emphasis on recent miles. I've used my old Octavia (TDi 110) mostly for commuting including a 1 mile climb at journey end going to work. I got an acceptable overall consumption. I also used it for meeting people off a car ferry, covering about twice the distance on a more level route including my commute except for that last mile. I could complete the trip to the ferry terminal with more remaining range than I started with. So I think you're placing too much reliance on the trip computer figures.

Edited 10 September, 20232 yr by Paws4Thot

4 hours ago, Apollyon001 said:

I did a 50 miles journey today and used 70 miles of fuel to get there.

 

I'm sure that you realise that really does not make any sense, Pawsfothot describes how it works very well.

 

You could say that had you driven with a lighter foot or taken a less hilly or less urban route (or whatever really) you could have driven 70 miles on the 5 litres or so of fuel that you consumed to travel 50 miles.

 

Its done so that you are not going to set out on say a 600 mile journey having seen a range of 700 miles indicated and run out of fuel during the journey because you are driving faster or towing or whatever compared to your recent journeys.

 

There is another thing at play in that you may get an accurate " 600 miles remaining figure" at a full tank if your journey profile remains the same and it will be spot on at 3/4 tank showing 450 miles, half a tank showing 300 miles but around 3/8 of a tank the remaining miles and the fuel needle will drop like a stone, this is to create a "virtual" reserve capacity of 5-7 litres of fuel when the needle shows zero and the MFD shows zero miles remaining, you will have covered in this example say 540 miles and you will be able to drive another 60 miles to the 600 mile point and some way beyond in complete security (assuming journey and driving profile unchanged) I have done this with every tank of fuel for 18 years now.