I've just finished my first tank of fuel in my 2008 Octavia estate, 140PS diesel with DSG.

My calculations give me 35mpg, the fuel computer display gives me 38mpg. Someone at work with a manual version is getting 48-52 mpg, so clearly something is amiss. I am driving sensibly, within the speed limit.

The car is going in to a Skoda dealer to fix the parking sensors on Monday, so I will ask them to look at reasons for the fuel economy too. I remember from a few years ago when I had a 1.9TDI Golf that people often pointed to the MAF when they had bad fuel economy. Is this still a likely culprit?

Thanks,

Mike.

I've just finished my first tank of fuel in my 2008 Octavia estate, 140PS diesel with DSG.

My calculations give me 35mpg, the fuel computer display gives me 38mpg. Someone at work with a manual version is getting 48-52 mpg, so clearly something is amiss. I am driving sensibly, within the speed limit.

The car is going in to a Skoda dealer to fix the parking sensors on Monday, so I will ask them to look at reasons for the fuel economy too. I remember from a few years ago when I had a 1.9TDI Golf that people often pointed to the MAF when they had bad fuel economy. Is this still a likely culprit?

Thanks,

Mike.

In my experience the DSG box tends to drink more fuel than a manual car...

One reason why i always stick with manual diesels.

I've just finished my first tank of fuel in my 2008 Octavia estate, 140PS diesel with DSG.

My calculations give me 35mpg, the fuel computer display gives me 38mpg. Someone at work with a manual version is getting 48-52 mpg, so clearly something is amiss. I am driving sensibly, within the speed limit.

The car is going in to a Skoda dealer to fix the parking sensors on Monday, so I will ask them to look at reasons for the fuel economy too. I remember from a few years ago when I had a 1.9TDI Golf that people often pointed to the MAF when they had bad fuel economy. Is this still a likely culprit?

Thanks,

Mike.

My 2008 CR has been getting less than 400 miles per 55L fill, so around 35MPG. The car went in to have the DPF regenerated yesterday as it wasn't happening automatically, hopefully I will get better MPG but I won't know for sure until I can refill and see how far the car goes before empty.

How are you calculating the MPG? Brimming the tank and then seeing how many miles range you get before refilling?

Yep, just done my first brim to brim and calculated from that.

I was getting 27mpg in my 3.0 6-cyclinder BMW automatic petrol, so was expecting better than this.

I thought the DSG box was a very efficient automatic, in fact not far off a manual?

In my experience the DSG box tends to drink more fuel than a manual car...

One reason why i always stick with manual diesels.

Official MPG figures for the 2.0PD are 47/51 for DSG/Manual which is a much smaller difference than observed by the OP.

Yep, just done my first brim to brim and calculated from that.

I was getting 27mpg in my 3.0 6-cyclinder BMW automatic petrol, so was expecting better than this.

I thought the DSG box was a very efficient automatic, in fact not far off a manual?

Figures for the 2.0 CR state 47MPG for both DSG and manual.

Is the PD DSG a 5 speed or 6 speed? That might explain why PD DSG cars have lower economy.

Figures for the 2.0 CR state 47MPG for both DSG and manual.

Is the PD DSG a 5 speed or 6 speed? That might explain why PD DSG cars have lower economy.

It's 6 speed, and sits in 6th for my motorway miles.

Most of my driving has been commuting which I would break down as 30 miles motorway and 4 miles urban start/stop twice a day.

My Leon PD140 DSG does 42-45 on my daily commute (about 7 miles urban, 19 high-speed motorway), Will drop below 40mpg in very bad traffic or being silly. Will go over 50mpg in more favourable conditions.

I can't help with the cause, but can confirm that unless you have forgotten to change out of second gear, you should get quite a bit better economy than you are seeing.

My PD140 hatch with a manual gearbox averaged about 48mpg when calculated - the dash showed about 52mpg

Definitely something wrong. Those figures are exactly the same as I am getting from my 1.8TSi with DSG - around 37-40 on the maxidot and 35-37mpg brim to brim.

I am off to the local motor factors this afternoon to get a new air filter as my first attempt at fixing things.

Sounds like a plan - the standard 40k replacement frequency is FAR too long...

like all thing with economy its mainly down to how you drive it.

I had a BMW118d which the official combined figure was something like 64mpg.

I was lucky to see more than 45mpg out of it.

I regularly had 55MPG+ on my 2.0TDI PD 140 DSG Octavia 2.

like all thing with economy its mainly down to how you drive it.

I had a BMW118d which the official combined figure was something like 64mpg.

I was lucky to see more than 45mpg out of it.

I am deliberately driving carefully and under the speed limit, with as little right-foot action as possible in order to maximise my economy. This morning I did 20 miles at a constant 60mph on the motorway, and managed to get the trip computer up to 42mpg. Clearly something is wrong! I will change the air filter tonight and get the local Skoda garage to check for any faults on Monday, as the parking sensors are due to be checked out with them.

Sounds like a plan - the standard 40k replacement frequency is FAR too long...

+1

Another thing is, if your coolant temperature sensor is playing up (very common fault) then it could also be over fuelling the engine (as the ECU will be thinking the engine is always cold, so injecting too much fuel)

A VCDS scan would be my first thing to do.

+1

Another thing is, if your coolant temperature sensor is playing up (very common fault) then it could also be over fuelling the engine (as the ECU will be thinking the engine is always cold, so injecting too much fuel)

A VCDS scan would be my first thing to do.

I don't have VCDS, but if I ask the dealer to check for fault codes, will this be as good?

As they are checking the parking sensors anyway they will have the diagnostic system plugged in so it is no harder for them to do a full scan of the car.

Just make sure they don't try to sting you for a scan - as this can easily cost £70+ from some dealers and will take them almost no longer than scanning just the parking sensors.

I would expect them to do the scan for free as it's in for something else and still under Skoda warranty. That's if they want my business in the future :wonder:

I would expect them to do the scan for free as it's in for something else and still under Skoda warranty. That's if they want my business in the future :wonder:

My car (2008 and so under warranty) was scanned last week as I'm also having fuel economy worries, the scan picked up that the DPF needed a forced regen (it wasn't regenerating on my day to day driving).

Until I've run through this tank of diesel I won't know if the fuel economy is better or not.

Edited 27 October, 201015 yr by Lou_O

I don't think mine has a DPF (mine has double exhaust pipes pointing down), so one less thing to worry about. I also haven't seen a dpf icon light up on the dash. :think:

If I understand you correctly, you have a 2008 L&K 2.0TDi, so that'll be the PD140 unit. And as such, doesn't have a DPF. So one less thing to worry about.

Yes, a dealer diagnostic scan will show up the same errors that a VCDS scan would. And if it's in for something else (parking sensors?) that would require a diagnostic scan to resolve anyway, then it won't take any longer.

Even with warrantied vehicles some dealers try to charge for the initial scan - in order to look into what's wrong. That's wrong in my book, as you're taking it in for a fault you've clearly identified; how they look to sort it is upto them

Best of luck with it,

Steve.

I changed the air filter, and my normal run today showed an average of 40mpg, so an improvement of about 2 mpg on the trip computer. I was driving like an old lady though (no offense to old ladies, I bet they get good mpg!).

I also have been disappointed with my MPG I have a regular 5 mile commute to work and now that it has 10,000 miles on the clock it is only now getting above 40 MPG. On a long run on mainly fast A roads and motorway at about 70-75 MPH I am lucky to get anything over 42 MPG.

Ian

Well, I am at a loss.

The garage scanned for faults, apparently there are none.

I specifically asked for temperature sensors to be checked, and they said they were OK. They cannot suggest a reason for the poor fuel economy.

This is the first VAG diesel I've had that has done under 48mpg from a tank. And I wasn't trying to be economical in those.