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Diesel fuel economy

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27 minutes ago, BriskodaJeff said:

Yesterday morning commute - the best figures I have seen so far from my 190 2WD.

image.png.4823a04d22ee7ee7a5e3069c4625f36a.png

Interestingly, the reason I looked was because I was pushing on a bit more than usual, so wanted to see how badly I'd dented the mpg! Very happy indeed - maybe I've got the mythical car that gets better mpg the faster it goes:biggrin:

 

I noted on my commute (25 miles each way - mainly motorway) the other day, that doing 70mph, as opposed to 60mph, actually IMPROVED the economy, which I thought was quite odd.  Long-term average has gone up from 41.2mph on the maxidot, to 46.5mpg since the beginning of the month when my commute has been longer due to a change in work base.  I didn't know that supermarkets changed the mix in the diesel over winter, and also didn't know warmer weather would improve MPG - I've always been taught that colder weather is better (denser, colder air = better for the engine for power and mpg), but I too have noticed it's improved with the milder weather.

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  • Asking other people about fuel consumption is pointless. We do not know how you drove over those 35 miles, we don't know what the roads were like, we don't know what the trafic was like, we don't know

  • I have finally came to the conclusion that I shouldn't worry that my car only makes 40 something mpg on average and I should stop driving around in Eco mode  like I was driving Ms Daisy to improve fue

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27 minutes ago, Offski said:

^^^

They exist.  'Unicorns' the latest of Euro 6 TDI's and some others.

 

Coasting function functioning and also the RPM just right where momentum / speed is kept up and diesel is being sipped.

(Hypermiling made easy through advances in technology while still having reduced emissions.   Big cars as economical as smaller city cars.)

I'm trademarking that! Skoda Superb Unicorn Edition...:biggrin:

 

No coasting - normal mode all the way. But I agree there is a "sweet spot" where the planets align at motorway speed - clever engineering and clearly designed to operate that way as around town it is hopeless (lucky to see 35).

9 minutes ago, hwr1983 said:

 

I noted on my commute (25 miles each way - mainly motorway) the other day, that doing 70mph, as opposed to 60mph, actually IMPROVED the economy, which I thought was quite odd.  Long-term average has gone up from 41.2mph on the maxidot, to 46.5mpg since the beginning of the month when my commute has been longer due to a change in work base.  I didn't know that supermarkets changed the mix in the diesel over winter, and also didn't know warmer weather would improve MPG - I've always been taught that colder weather is better (denser, colder air = better for the engine for power and mpg), but I too have noticed it's improved with the milder weather.

I think the colder and denser equals better arrangement was for older cars before direct injection etc - but I'm no mechanic. Mine is definitely at least 5mpg better (and potentially more) than it was when I got it. Convenience consumers tells me that lights, heated seats etc is part of that, but I'm also wondering whether it has just "loosened back up" following a month of inactivity over Xmas where I had ordered it but not yet picked it up. Either way - I'm not complaining!

?

Do you disable (turn off) 'Coasting Function' so that when you are off the accelerator the gears do not disengage?

When Coasting Function is functioning it shows just 'D' when coasting and not D5, 'D6' or whatever. 

 

Colder denser air is perfect with up to operating temperature TDI's Euro 5 / 6.

Why there are Intercoolers, so that you feed the Unicorn cold air.  Cooler weather uses less energy, because cooling engines in hot ambient temperatures requires energy to bring down the temp of Coollant to cool oil, also a coolant.

A bit simplistic, but that how things are with ICE's.

 

DSCN1213.JPG

Edited by Offski

Sorry Offski - may just be my lack of understanding of how it works. It's a DSG so the car does all that for me, and driven pretty much all the way on ACC, with the occasional prod to keep up speed while overtaking (that is what I thought had dented the mpg yesterday as I was constantly having to speed up to get round lorries overtaking each other at 54mph). I'd understood the coasting function was only in Eco mode, but may have that completely wrong. I was in normal mode all the way.

Best read the Owners Manual. 

My best consumption on 2WD 190 TDI was 42mpg / 5.5l/100km so just WOOOOOOOOW! 

25 minutes ago, Offski said:

Best read the Owners Manual. 

I thought I had:biggrin:. This is what mine says

image.png.de6a842f3ee4d06e15c2530871797d38.png

I don't use Eco so I am guessing coasting is disabled by definition? I've certainly never seen a coasting function like the one in your picture.

 

11 minutes ago, JackySi said:

My best consumption on 2WD 190 TDI was 42mpg / 5.5l/100km so just WOOOOOOOOW! 

My commutes are about the best you can get for consumption - all motorway / fast A road. Yesterday I would estimate less than 3 miles of the 88 mile journey was not on the motorway. Around town I can see 35mpg regularly - which is why I avoid local journeys as much as possible!

I thought coasting was only available in eco mode too. Pity as I find it's rather useful round here, but would prefer normal gearing/acceleration.

 

1 hour ago, JackySi said:

My best consumption on 2WD 190 TDI was 42mpg / 5.5l/100km so just WOOOOOOOOW! 

 

5.5l per 100kms is 51mph, so it's actually performing slightly better than you thought. You must have converted to US gallons, which are different (confusing I know:blink: - give me metric any day).

22 minutes ago, The Wanderer said:

I thought coasting was only available in eco mode too. Pity as I find it's rather useful round here, but would prefer normal gearing/acceleration.

 

 

5.5l per 100kms is 51mph, so it's actually performing slightly better than you thought. You must have converted to US gallons, which are different (confusing I know:blink: - give me metric any day).


Heh =) Well that's my best. Usual average is 6.4L on last 10.000km (long range average). On my mothers Octavia I had about 4.8L./5L. The MPG is little confusing yeah ^^

Re 'Coasting Function'.   that might not appear unless you have that on Maxi Dot, if you are looking at Oil Temp'  Range or something it might not show.

 

The best hint is if just 'D'  shows when you are not on the accelerator & not D3, D4, D5 or D6.   or on 7 Speeds D7.

This is a long run result, where the diesel engine is best suited, from Brecon, Wales to Klaipeda, Lithuania which was 1,575 miles and the display shows 57.2 mpg.  I was getting just over 60 mpg for the first part of the journey, but a strong headwind on the last leg from Bialystok, Poland to Klaipeda knocked the average down.

On 4/25/2018 at 08:41, hwr1983 said:

 

I noted on my commute (25 miles each way - mainly motorway) the other day, that doing 70mph, as opposed to 60mph, actually IMPROVED the economy, which I thought was quite odd.  Long-term average has gone up from 41.2mph on the maxidot, to 46.5mpg since the beginning of the month when my commute has been longer due to a change in work base.  I didn't know that supermarkets changed the mix in the diesel over winter, and also didn't know warmer weather would improve MPG - I've always been taught that colder weather is better (denser, colder air = better for the engine for power and mpg), but I too have noticed it's improved with the milder weather.

 

Colder weather means denser air for the engine, but the turbo wastegate means you won't get more pressure in the cylinders . . 

 

Warmer weather means

  • less dense air so less drag
  • Slightly warmer tyres so less rolling resistance
  • less wax in fuel 
  • driver in better mood
  • Less cars on the road (holidays)

I find that any changes of speed, hills and rain/standing water and weight in the car affect economy

  • Mine is far better from 10A to 11 on the M6 than it is from 10 to 10A.  I am generally on cruise going through there at 63-64 but it is a very gentle slope.  
  • On a heavy traffic day the MPG to work is about 4-5 less than a light traffic day when I would be travelling faster.  Doesn't mean going faster uses less - just fewer speed changes.

Cold road surfaces & cold tyres less traction / friction / grip / resistance, why you get flashing ASR / TC lights, wheel spin. Crashes.

Warmer tyres more grip / friction / more rolling resistance.

Which is way you warm up tyres before racing.  Change to winter tyres in winter on colder roads where ECO / Summer tyres have less grip.

Harder compound rubber / sidewalls / less tread on road being what ECO tyres and tyre pressures are.

 

Winter grade diesel November to March and no waxing and if there is 'waxing' then you are going no place.

Different World Regions different Anti-waxing is in your Diesel, and there is Winter Formulation petrol as well.

In the UK at -15oC and lower to -20*oC there are parts of the UK where diesels are not waxing obviously, location location location.

There are people driving where the average temp over 7 days is 0*C and they get good fuel economy.

PH20 Post Code this winter that was 6 weeks November to March, and AB55 5 weeks.

 

Warmer or hotter weather the vehicles engine is quicker up to the efficient operating temperature, coolant and oil and oil is a coolant, 

but then when the oil is getting hotter cooling it requires energy and that uses fuel. 

Hotter engines / oil into the 100*oC and rising there can be Heat Soak.  Higher elevations above Sea Level and loss of performance 

but you are not getting that in the UK unless you are flying in your car.

 

Cool running can give very good fuel economy with Turbo and Supercharged engines, and why there are intercoolers.

You need to be going far enough to have the Engine / Engine Oil it the Normal / efficient operating temp.

Edited by Offski

  • Author

I have finally came to the conclusion that I shouldn't worry that my car only makes 40 something mpg on average and I should stop driving around in Eco mode  like I was driving Ms Daisy to improve fuel consumption. I bought the car so it could cruise and if need be shift when I occasionally wanted to put the foot down. I have a smaller car I use for around town and commuting to work. When I do take my 190 4X4 DSG  out in future, although I won't be accelerating hard and braking late,  Eco mode can go to hell. I want to ejoy the drive as much as I like the interior. So those of you bragging that your 150 will regularly do plus 60 to the gallon if it floats your boat I'm happy for you but  I ain't that interested.

1 minute ago, Muff said:

I have finally came to the conclusion that I shouldn't worry that my car only makes 40 something mpg on average and I should stop driving around in Eco mode  like I was driving Ms Daisy to improve fuel consumption. I bought the car so it could cruise and if need be shift when I occasionally wanted to put the foot down. I have a smaller car I use for around town and commuting to work. When I do take my 190 4X4 DSG  out in future, although I won't be accelerating hard and braking late,  Eco mode can go to hell. I want to ejoy the drive as much as I like the interior. So those of you bragging that your 150 will regularly do plus 60 to the gallon if it floats your boat I'm happy for you but  I ain't that interested.

 

Interestingly, you may find your economy improves when you stop using eco mode and forget about trying to drive economically. I'm one of those 150 drivers bragging about 60+ per gallon and I've never used eco mode. I rarely use 6th gear unless on a clear stretch of motorway, and I don't try to drive in any way 'economically'. Inexplicably I find that if I try to use 6th gear on free flowing A roads, my mpg drops, and that's well within the rev range for the gear, so not struggling at low revs. My approach is to drive in a relatively spirited yet smooth way, but I do prefer to read the road ahead so I don't need to do more heavy braking than necessary. Forget about economy, and you'll probably find it follows regardless.

11 hours ago, Muff said:

I have finally came to the conclusion that I shouldn't worry that my car only makes 40 something mpg on average and I should stop driving around in Eco mode  like I was driving Ms Daisy to improve fuel consumption. I bought the car so it could cruise and if need be shift when I occasionally wanted to put the foot down. I have a smaller car I use for around town and commuting to work. When I do take my 190 4X4 DSG  out in future, although I won't be accelerating hard and braking late,  Eco mode can go to hell. I want to ejoy the drive as much as I like the interior. So those of you bragging that your 150 will regularly do plus 60 to the gallon if it floats your boat I'm happy for you but  I ain't that interested.

 

Nothing grates more than being in a queue on an dual carriageway A road where lorries are queuing to overtake a hyper miler that feels that by doing 50 MPH and dragging out thier own MPG they are doing us all a favour:angry:

 

Have they never looked in the mirror and seen the size of the queue behind them and the open road in front. :@ 

 

Use the car as designed, get out of the gutter and stop being a traffic jam. 

Edited by Bud

  • Author

I totally agree Bud.  I normally do between 60 and 80 on a dual carriageway and over 70 on a motorway but never fast enough to get me a yea's driving ban.

  • 5 months later...

Real life MPG with my DSG 150 diesel sportline 

 

Note 22nd and 28th August cost is in euro. Not bothered on price per litre so not converted. 

8D88ED91-76E9-4733-82DC-4532D6C968DA.png

Edited by aldouk

3 minutes ago, aldouk said:

Real life MPG with my DSG 150 diesel sportline 

 

The problem with mpg threads is that obsessed hypermilers and grannydrivers set ridiculously high targets, boy racers set the bottom bar, whereas someone who's just in a hurry to get to work or wants to get home to bed get somewhere in between, probably at the lower end rather than the higher.

 

Confusing for someone just wanting to know what to expect 

6 minutes ago, xman said:

 

The problem with mpg threads is that obsessed hypermilers and grannydrivers set ridiculously high targets, boy racers set the bottom bar, whereas someone who's just in a hurry to get to work or wants to get home to bed get somewhere in between, probably at the lower end rather than the higher.

 

Confusing for someone just wanting to know what to expect 

 

Edited by aldouk

Very very true. 

 

That to to me is realistic may not be to someone else. However that. Includes over the months a wide mix. 

School runs

Town

Short motorway

Long motorway

You can see the 47mpg is a drive about in Ireland along tolls and a long commute. Pleased as that was fully loaded and not hanging about. 

Edited by aldouk

2 hours ago, xman said:

Confusing for someone just wanting to know what to expect 

 

Not so sure it's confusing - it's just an impossible question to answer. In my 190, short town journeys return c35mpg. On the motorway on a long run I can see 58+ while not straying too far over the speed limit. That's the MPG range*, and the problem is it's huge. Where anyone falls in that range depends on how  much of each type of drive they do and, importantly, on their own driving style.

 

* It isn't the MPG range of course - it's my MPG range based on my driving style. As such, it's of little use to anyone else other than as the roughest of rough guides. As of course @skidpan pointed out in post 2 of this 4 page thread!:D

  • Author

My average mileage over several months is also in the mid 40s. I don't think I drive like or boy racer or driving Miss Daisy so I guess that's pretty much standard for a 190 DSG. 

 

Good results from a run to Winchester and back:

 

Total of range and miles since refuel is 1,035 miles.  Now it is a 2.0 150 and 2wd but going down was with cruise set ot 75 and coming up a little slower.  Could have been a higher number since from leaving the M6 Toll to where I parked the range dropped 35 miles in 5 miles but you have to take my word for that!

 

This car is very economical when it is at a steady speed, stopping and starting kills the economy.

 

It is also nicely run in having done over 30k miles.

20181003_154231_resized.jpg

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