Couple of weeks ago i had full servicig in 41k miles of my 1.4tsi (67 plate). That means Oil, oil filter, air filter, spark plugs.

After servicing i strangely found that car is consuming more fuel than it was before. I used 5w30 long life oil as it was recommended from this forum as well as Skoda dealer. Since servicing i am driving it regularly in local and motorway, but it consuming more fuel..Does anyone have any idea why its consuming more or you think its normal?

 

Seems to be a repeat of an earlier thread.

 

I was also thinking that I had the same issue with my previous car as well. but anyway, that was with my 1.6tdi and this one is 1.4tsi. Same sort of problem..is it quite normal with octavia? Anyone else having concern of this sort? One of the other skoda dealers was refering me to different type of oil, right now i forgot the grade but not definitely 5W30. So I dont know if the consumption increased because of oil changing.

@ordsI was going to say the same.

Usually servicing a car is a good idea, but maybe @automass should leave his car unserviced.

The only other oil if not VW504 00 / 507 00 Long Life that should have been used is VW502 00 for Fixed Service Intervals, so 5w 40 FS.

 

Or they could have gone 0w 30 FS III.     But you had best find out.  But really the fuel consumption should not increase with 5w 40 FS.

 

?

How much more fuel is it using now than last month?

Have you brimmed the tank and seeing what you are getting from however many litres?

 

I hope you are enjoying having 7 gears now that you know you have that many.

Edited 18 March, 20215 yr by e-Roottoot

4 hours ago, automass said:

Couple of weeks ago i had full servicig in 41k miles of my 1.4tsi (67 plate). That means Oil, oil filter, air filter, spark plugs.

After servicing i strangely found that car is consuming more fuel than it was before. I used 5w30 long life oil as it was recommended from this forum as well as Skoda dealer. Since servicing i am driving it regularly in local and motorway, but it consuming more fuel..Does anyone have any idea why its consuming more or you think its normal?

 

It might be because the air filter previously fitted was clogged up. Now it is breathing more freely it will use more fuel to compensate the extra air going in. 

 

Well, I didn't brim the the tank to test the consumption. but since servicing i am getting around 20-30miles less than what I used to get. I did fill the tank yesterday to the full and i reset the trip to 0. everytime i fill the tank i set the trip meter to 0 without fail. Thats why I know that car is consuming more than what it supposed to. Anyway, if Engine oil or Spark plugs are not the influencing factors of more fuel consumption, then i better end the thread here.

I'll come back to this post if it gets worse. but so far its manageable and probably consumption will get back to normal. I was just wondering if anyone else has ever experienced this issue.

20-30 miles less really explains nothing if you are not saying how much fuel that is used.

What is that based on, as in how many litres are being used.

 

How far car the can go on 1 litre or 4.46 litres (or maybe 45 litres), so a gallon or 10 gallon is all that really matters for where you drive and how you drive. 

Edited 19 March, 20215 yr by e-Roottoot

Seeing as how there are a couple of recent posts from different Octavia types about a sudden worsening of consumption I thought I might suggest something a bit different from the others (very plausible) suggestions.

 

A lot of people just set and forget the climate control A/C so it is on all the time, and there is nothing wrong with that. However climate control A/C also controls humidity and I'm just thinking that if the weather has changed from just cold, to wet and cold, then the A/C might be operating both heating and cooling to reduce the humidity which would increase consumption.??

 

I've not experienced this in the UK myself (none of my UK cars had A/C 40 years ago) but relate it to an occasion when I got my worst open road consumption in unusual local (South Australia) conditions in my 1.4tsi Octavia.

It was very overcast but hot (32 deg C) and very high humidity and very uncomfortable so naturally I had the manual A/C on (not climate control) but even on the lowest fan setting it made the inside of the car far too cold. So I had to put the heater on as well to offset the cold air and the combination meant my average consumption plummeted by over 10mpg for that specific 250km journey which I had done many times before in all sorts of weather conditions without the punitive results.

 

 

On 18/03/2021 at 17:54, e-Roottoot said:

@ordsI was going to say the same.

Usually servicing a car is a good idea, but maybe @automass should leave his car unserviced.

Another +1 couldn't find the thread from a search though 

I had my car serviced just prior to the incident where something smashed the oil sump of it, before the service if I filled the car to the brim the range would show 340-345 miles.

 

After the service it only showed 320-325 miles, so after the service I've lost 20-25 miles of range for some reason, it hasn't changed from 325 since the car has been repaired and oil replaced. I'll admit that I'm a bit miffed by the loss of 20-25 miles of range.

So, I am not alone. I think people who are taking my thread as fun they didn't pay attention of their consumption. I cant find any reason the consumption to be higher. I used to get 52mph on 50mph road..now barely I can see on my  infoteinment that it can reach to 42mph max. I know people will be saying brim the tank, have proper calculation.. Use the spread sheet or consumption calculation chart blablabla...

But i know my car and its consumption..definitely it drops down.

@TheWanderer

The car was sitting idling in the workshop for ages and it was taken for a road test.

 

Or are we talking actual just a change in the range and not actually what was used while the car was in for the service.

 

@automass The thing about your observations and accuracy with fuel consumption is that when your dash showed D7 you never noticed the car had 7 forward gears.

 

Brim the tank and have proper calculations for how far you can go for however many litres are used.

Edited 21 March, 20215 yr by e-Roottoot

When I fill the car it's always to the brim and driven normally, it makes no difference if I choose Eco or Normal modes, the range will max out at 325, this is since it's 1st service.

 

So the range has dropped from 340-345 miles per tank, prior to the 1st service to 320-325 afterwards, I would have thought that after the 1st service and now 12k miles it would be approaching it's optimum, so around 330-335, so still 5-10 miles shy of what I would have expected. 

29 minutes ago, e-Roottoot said:

 

@automass The thing about your observations and accuracy with fuel consumption is that when your dash showed D7 you never noticed the car had 7 forward gears.

 

Brim the tank and have proper calculations for how far you can go for however many litres are used.

 

Noticing to 7th gear is far more difference than noticing to fuel consumption. As I mentioned previously, I always fill the tank to the full (when it cuts off automatically then i stop. i do not overfill the tank) and set the trip meter to '0'. I never forget it and have been doing this practice since 2017. So definitely I am losing miles after this service.

Edited 21 March, 20215 yr by automass

@TheWandererSo what actual miles do you get from that brimmed tank?

Do you even get 30 mpg if you were to use 10 or 11 gallons of the fuel in the tank?

 

@automass

The gear number is right there all the time regardless of what you have the maxidot showing.

re your MPG.

So how far can your can go if you were using 10 gallons or around 45 litres?

Edited 21 March, 20215 yr by e-Roottoot

On 18/03/2021 at 19:26, Ecomatt said:

It might be because the air filter previously fitted was clogged up. Now it is breathing more freely it will use more fuel to compensate the extra air going in. 

 

So why bother to change the filter if it's going to make the mpg worse?

16 minutes ago, e-Roottoot said:

 

 

@automass

The gear number is right there all the time regardless of what you have the maxidot showing.

re your MPG.

So how far can your can go if you were using 10 gallons or around 45 litres?

 

I know where the gear sign is. i never needed to pay attention to it where as my infoteinment is always set as Driving data and Displying Since Start mode. I am always concern about fuel consumption.

well. I have just filled the tank couple of days ago to the full. i'll update this thread about proper mpg when i'll fill up the tank again.

@automass  What were you actually getting before the Service then?

Not just what the car was showing as an average, but how far would 45 litres take you?

 

what was the 20-30 miles less from?   You never said what the MPG you get is.

 

& what is the oil that shows on the invoice that they used if it is something different?

Edited 21 March, 20215 yr by e-Roottoot

Just now, e-Roottoot said:

@automass  What were you actually getting before the Service then?

Not just what the car was showing as an average, but how far would 45 litres take you?

I normally used to get minimum 330 to 340 miles by 42 liters.

24 minutes ago, ords said:

So why bother to change the filter if it's going to make the mpg worse?

Not worse. As filters become blocked your ecu will adjust the parameters to suit. However performance will drop and yes economy may increase slightly because the engine isnt running at full power. 

MPGs can be affected by air temperature, air pressure, tyre pressure, trye brand, wheels out of alignment, type of oil used in the engine, spark plugs incorrectly gapped or torqued, gearbox oil pressure, fuel quality, type of driving, road surface, road surface temperature etc. There are so many variables as to why the mpgs have gone down and up I have never worried about it or got hung up over it. Unless the car is running badly .i.e misfiring or being generally sluggish I wouldnt worry too much about decreased economy.

 

@automass

35 -37 MPG is pretty poor, so if you are getting a worse MPG than that now you need to look seriously at the car or maybe how you drive.

 

Or is that with the car carry weight as in passengers?

Edited 21 March, 20215 yr by e-Roottoot

5 minutes ago, Ecomatt said:

Not worse. As filters become blocked your ecu will adjust the parameters to suit. However performance will drop and yes economy may increase slightly because the engine isnt running at full power. 

MPGs can be affected by air temperature, air pressure, tyre pressure, trye brand, wheels out of alignment, type of oil used in the engine, spark plugs incorrectly gapped or torqued, gearbox oil pressure, fuel quality, type of driving, road surface, road surface temperature etc. There are so many variables as to why the mpgs have gone down and up I have never worried about it or got hung up over it. Unless the car is running badly .i.e misfiring or being generally sluggish I wouldnt worry too much about decreased economy.

 

 

I know all these factors about mpg. but nothing has changed except four brand new BUDGET tyres. My concern is after the service the consumption dropped down and the garage guy used a boy (apprentice) to do the servicing. I saw him strugling to open the spark plugs as well as air filter. I wasn't their while he replaced the spark plugs as I popped out to get coffe for myself.  I was confused about Oil grade too. So all these factors making me thik that servicing wasn't done properly hence the drop down of mpg.

@automass

You posted that you know it is 5w 30.  So that is the same as VW504 00, as long as it is to that spec.    5w 30 Full Synthetic III.

 

It took you long enough to mention the change of tyres.

?

So when were they fitted?

Before servicing I bumped into the curve and damaged two of my left tyres. Tyres were all almost nearly touching the minimal thread though except one. so I got the tyres changed from the corner tyre shop of the place I live  with a set of four (Budget tyre) around 3 or 4 days before servicing.

Edited 21 March, 20215 yr by automass