I own a 2017 Skoda superb 190 sel executive  Dsg hatchback 

I have had this car since February 2018 and it was an  X demonstrator 

 I am a taxi driver and I have driven this car for 38,000 miles always getting 550 miles approximately to the tank up to the fuel light coming on 

I always fill to the top of the neck and drive exactly the same and average overall approximately 40 mpg

 Since filling my tank on the 2nd of November my car has suddenly decided to only do 450 miles per tank 

 In fact sometimes only average on the day as little as 26.8 to the gallon 

It has been back to the Skoda dealership and they have found no faults with the car and technical at Skoda have suggested I have changed my style of driving

A small change in driving would not account For a 15 to 20% extra fuel usage

I have had a number of issues with this vehicle though only minor have taken quite a lot of visits to the dealership to correct

 This fuel consumption issue is just another of my problems I have experienced with this car 

 How many visits will I have to make to correct this fuel issue 

 Has anybody else had the same issue I wonder 

My worry is I only have about 19,000 miles or less than a year of warranty left what will I do if these issues although small in most cases continue

Oh and it’s diesel !!!

You are filling up with Winter diesel since late October but then you were doing that as well February into March as well.

That should not make much difference.

 

Is you air filter clean, was it changed?

 

?

What are the other issues that you have had.

 

OT, 

but your DSG is due an oil change in 2,000 miles.

 Thank you for your reply 

 My vehicle had a full service at 35,000 miles including transmission oil

 Winter fuel will make no difference whatsoever 

 Other issues I’ve had with this car has been the media system having a mind of it’s own including the satnav which was rectified by replacement media unit after six visits to the garage 

It has also had the phantom starting system for error which was rectified after four visits to the garage

I also had problems with suspension bushes front and rear which took four visits to the garage

 So I’m a little unhappy with this car especially as I use it for my living when you use it day in day out doing the same journeys you get to know what kind of consumption you are going to get 

@Flymo61

Could you explain what a 'Full Service Involves, is this the same as a Major Service & what does that cost?.

 

So what had it, Air Filter, Pollen Filter, Fuel Filter Oil & Oil Filter and any software update and a visual inspection & report?

?

Did you pay for the DSG oil change being done at that time?

?

Are you aware of the car doing more regens?

 

You had best ask them if any Engine Management software update has been done.

 

Are you doing your fuel consumption calculations the long way.

Or looking at what the car shows you.

My car is optimistic for half the year and pessimistic for the other half.

 

29 minutes ago, Flymo61 said:

Winter fuel will make no difference whatsoever 

Winter / cold / wet condition do worsen fuel consumption.

I have records going back 20 years showing me this.

 

Thanks AG Falco

 Thank you for your reply 

 Full service is self-explanatory !!

it had  everything and as I said I had the transmission oil changed as well at the same time 5000 miles early 

 It has been in to the dealer and he has been on their computer system and they have found no faults 

It has had a forced regen but the master tech said he doubted whether it would make any difference

And it hasn’t

 For those of you who have not understood the problem 

 

 The vehicle has done 550 miles for the given quantity of fuel for the last 38,000 miles 

 It is now only doing approximately 450 miles for the same given quantity of fuel 

!!!

Also it was doing 550 miles for the same amount of fuel  The same time last year so it’s nothing to do with temperature rain clouds or even rabbits flying in the air 

Is it only you doing the driving / taxi work, no other driver that sits with it ticking over more than you do?

I’m the only driver

And I don’t sit with it ticking over !

1 hour ago, AGFalco said:

Winter / cold / wet condition do worsen fuel consumption.

I have records going back 20 years showing me this.

 

Thanks AG Falco

My experience in the 190TDI also. My summer consumption is 55mpg pretty much without fail. Same route every day, 90% motorway. Now I'm seeing 50. As well as winter diesel, the convenience consumers will be using more fuel than in summer. Same thing last year. Around town it reduces to less than 40. So I could believe that kind of drop. I doubt it is anything sinister, though I am sorry to hear about the other problems the OP has had.

Thank you for your reply

 Just to remind you as I stated earlier I get 550 miles for the tank regardless of time of year or time of day in the summer winter autumn makes no difference 

 My car suddenly started doing 100 miles less per tank full with no apparent reason 

I suggest you open the air box and see that they did change the air filter.

 

1st tank fill of winter diesel my 2.0 TDI 150 ps DSG went from doing 630 miles for 63 litres to 730 miles.

It loves the winter diesel and cooler weather and the same journeys i do all year so no difference on time to defrost etc etc. 

Brakes binding? Feel all the wheels after a long run, is one hotter than the others - be careful as they do get hot! Are all your shouts the same as previously, any extra town runs instead of airport runs will really screw the consumption.

No brakes binding !!!

Was checked for that on Wednesday when it went in to the dealers 

I personally wouldn't trust a $tealers word, they are all tell lies at times - well only when their lips move maybe.

I had a VX garage try to charge me for a brake service that they apparently managed to do without taking the wheel trims off, and yes it was a while ago...

8 hours ago, AGFalco said:

Winter / cold / wet condition do worsen fuel consumption.

I have records going back 20 years showing me this.

 

I can catigorcaly confirm that cold winter air will not adversely affect your mpg. Go to your local dyno or any dyno and tell that to the tuner and he would explain that it's the opposite. A car engine loves cold air, especially a turbo'd car where air is compressed (which in its self creates heat) Its not quite as important on a normally aspirated application but still, colder the better. 

 

If you stick any FI (forced induction meaning turbo or supercharger) car on a dyno it will always produce its highest power run on the first run unless you allow extended cooling time as heat soak occurs. This means, heat from your engine radiates to your intercooler, which in effect is the same as a hot sunny day and heat bouncing back of the tarmac and blowing through your intercooler/charge cooler. 

 

As for rain and your tyres regarding mpg, I wouldn't know but I would doubt it would effect it more than a fraction, personally I don't think you would notice it. It rains in the summer also. 

 

I always think there are more cars on the road in the winter as people don't walk anywhere in the rain so your journey takes longer, this would seem more plausible than this "winter diesel" people on here talk about. 

 

 

Edited 23 November, 20196 yr by paperclips

You will have to excuse my spelling people, it's not letting me edit. 

 

Edit: although it's saying I did edit! Haha!? 

 

 

Edited 24 November, 20196 yr by paperclips

2 hours ago, paperclips said:

 

I can catigorcaly confirm that cold winter air will not adversely affect your mpg. Go to your local dyno or any dyno and tell that to the tuner and he would explain that it's the opposite. A car engine loves cold air, especially a turbo'd car where air is compressed (which in its self creates heat) Its not quite as important on a normally aspirated application but still, colder the better. 

 

If you stick any FI (forced induction meaning turbo or supercharger) car on a dyno it will always produce its highest power run on the first run unless you allow extended cooling time as heat soak occurs. This means, heat from your engine radiates to your intercooler, which in effect is the same as a hot sunny day and heat bouncing back of the tarmac and blowing through your intercooler/charge cooler. 

 

As for rain and your tyres regarding mpg, I wouldn't know but I would doubt it would effect it more than a fraction, personally I don't think you would notice it. It rains in the summer also. 

 

I always think there are more cars on the road in the winter as people don't walk anywhere in the rain so your journey takes longer, this would seem more plausible than this "winter diesel" people on here talk about. 

 

 

I hope you are referring to someone else on hear regarding what you have written here as I am in complete agreement with you 

I have Put a simple question out regarding my problem regarding my fuel consumption and it occurs to me there is a number of people on here who are frankly no idea what they’re talking about with things like winter diesel and Have you  calculated your fuel consumption correctly 

I’ve joined this forum just to see if anybody has had similar problems and I have been bombarded with frankly a load of **** so when you have written what you have written here it’s a breath of fresh air to have somebody that actually knows what he’s talking about

 And I thank you for that 

All I said was as follows

 I have got 550 miles to a tank of fuel at the point of the fuel light coming on but now it has dropped 100 miles down to 450 to the tankful I just wondered if anybody else had experienced the same thing 

 Frankly I wish I hadn’t bothered 

1 minute ago, Flymo61 said:

 Frankly I wish I hadn’t bothered 

So do we, pal.

 

People are only offering their suggestions as to why your consumption has worsened.

To me, this is what you asked them to do.

 

They are amateurs, not paid professionals, and are doing their best to offer you some help from their experience.

Why would you berate ordinary people who are trying to help, when you have failed to get an answer from "expert" Skoda dealers?

You have also failed to find a cause yourself, so what makes you think you are better/more knowledgeable than the decent folk who have offered you some help?

 

I could link you to another site where the subject of winter consumption in diesels is discussed at length, including evidence that consumption does worsen in cold weather,

but I don't think I'll bother.

 

 

You won’t bother !!!

well thank **** for that buddy 

 

I know you say you brim the tank but not the fuel used to brim it. If you put 50L into 550 miles and 41L into 450 miles nothing much has changed other than when the light came on!  Need fuel used over fill distance to be sure but in your figures 62L for 550m and  51L for 450 miles are 40mpg ish.

@Flymo61

 

I suggest you review whether your frustration and disappointment are clouding your judgment. Ad hominem attacks are never helpful and your aggressive judgements are unlikely to bring positive responses. This is an owners forum not a technical forum.

What I can see in the replies is a confirmation that people do experience some changes in fuel consumption AND that no one has confirmed similar significant effects. That is a result isnt it? Maybe not what you wanted but it is something useful IMO. 

When considering the impact of winter fuel consumption it is important to consider many variables beyond simple mechanics of a compression engine. Air temp usually colder, wind speeds usually higher, energy density which is lower in winter diesel, driving style in difficult conditions etc, etc. So it is a scientifically supportable fact.

Is it your problem? Seems unlikely as your drop is significant. Do I have a simple answer? No sorry but I do understand why people have offered all the possibilities that they have. Do come back and let us know when you have solved it so we can help others in the future.

13 hours ago, paperclips said:

I can categorically confirm that cold winter air will not adversely affect your mpg.

 

On the same journey to/from work every day I log fuel consumption.

The colder it is when the engine is started the worse the fuel consumption for that journey.

There is also more electrical load during the colder months.

 

During the winter I get better fuel consumption on the way home when it is warmer.

During the summer I get better fuel consumption on the way to work when it is colder.

The best conditions for me for good fuel consumption is when the temperature is in the teens.

But with the air being cool and dense.

So for me during the spring and autumn when you are not using the heater and or AC is best.

 

But with a taxi engine that is almost always warm it is less noticeable.

 

 

14 hours ago, paperclips said:

Go to your local dyno

Perhaps the engine on a dyno test is only done when the engine is already warm.

 

Thanks AG Falco