Does my MPG look big in this ?

[Arragonis]

Hi,

I started out with the idea of trying to maximise MPG with the A6 - OK, not the best starting material. But I'm kind of confused/concerned a little about what MPG I'm getting and when compared to other reports here.

I'm wondering if there is a problem.

Firstly no faults reported or recorded apart from an occasional glow plug issue maybe once every 7K miles. I think there is a marginal glowplug (always the same one) which maybe doesn't work quite as well when it is very very cold. Sometimes the engine will "rock" a little on startup but after 1-2 seconds it goes away and all is quiet for the rest of the day, even after being parked at work for ~8-9 hours. This has happened maybe once or twice a month during both winters I've owned the car, ~10 times in total.

My daily drive consists of about 25% town driving to get to the bypass (A-road dual carriageway) and 75% the remainder. In terms of time I spend about 40% of my commute stuck in traffic (Edinburgh hates cars and loves to delay them as much as possible) and the remainder moving. The DIS will report around 31-32 sometimes, tank to tank it more like 29 on those occasions.

Even on a run though the DIS will go as high as 38 but a tank refill is closer to 35, more often 33.

Performance is not that great. OK it isn't the full fat 3.0 but it seems lacking. Maybe more so than when it arrived but that would be subjective - I had a Toyota Aygo before

I'm wondering about injectors. From reading threads here I know these are

a) likely to fail more on early cars than later ones (mine is a 56 plate)
b) be expensive to replace and
c) hit MPG if / when not working properly.

Thoughts anyone, gup especially...

[Lukenkarl]

Gup did something about the actual mpg and dis mpg. Something to do with ecu alterations using VCDS....I think.. Search his posts

[Arragonis]

Gup did something about the actual mpg and dis mpg. Something to do with ecu alterations using VCDS....I think.. Search his posts

Yes, I saw that - he adjusted the DIS to match (his) reality in terms of MPG.

IMHO, and with respect to Gup, this was a waste of time as the DIS (like all instruments) is making a guess on consumption based on a pre-configured profile and sampling rate. He adjusted the guess factor which might work for him but will probably match nobody else. The standard guesses are those made by Audi.

The DIS and other instruments are really only useful for instant readouts, and even then they are wildly out. Just take a sample of your DIS - how many times do the same instant MPGs come out ever second or so, is it really recalculated in real time ?

Naw.

It's guessing. No more accurate than a wet finger in the wind to tell how warm it is.

This isn't really what I'm asking about though.

[JimC64]

Hey Aragonis...... sorry but maybe it's me ( it probably is ) but I'm still trying to figure out what you're asking?

Are you asking......

1. Is your mpg good or bad for your model?
2. How can you best improve your mpg?
3. How can you best read your mpg, as you don't trust DIS?
4. Do you have a problem with your car / injectors etc?

Thanks, hope to hear....

Jim

[Arragonis]

Hey Aragonis...... sorry but maybe it's me ( it probably is ) but I'm still trying to figure out what you're asking?

Are you asking......

1. Is your mpg good or bad for your model?
2. How can you best improve your mpg?
3. How can you best read your mpg, as you don't trust DIS?
4. Do you have a problem with your car / injectors etc?

Thanks, hope to hear....

Jim

Hi Jim

1, 2 and 4.

Cheers ☺

[gupsterg]

Hi Arragonis,

Yes, you are right that the adjustment I made to DIS will not be the same setting for everyone. Point of thread was that people would be made aware they can adjust DIS to match real world MPG more accurately. People will arrive at what adjustment to make by noting DIS average MPG and their real world and adjusting by looking at the difference between the two. Generally DIS on my car now 1-5% out which is better than 10%+ plus this adjustment effects range reading as well, instant average I never use/view as it fluctuates so wildly.

TBH I don't think for the financial layout for new injectors and other elements of work to improve MPG that you'd see such a big improvement to be able to justify it or recoup the outlay. Until you have real issue from the injectors not functioning correctly I'd just let it go for now.

When your doing comparison with other 2.7 TDi's are they non quattro cars?

[Arragonis]

Hi,

Thanks for looking in!

Agreed - your adjustments to the DIS will work for your driving profile. Have you noticed the instant readout only has a few fixed values ? It was an interesting hack though

TBH I don't think for the financial layout for new injectors and other elements of work to improve MPG that you'd see such a big improvement to be able to justify it or recoup the outlay. Until you have real issue from the injectors not functioning correctly I'd just let it go for now.

Thanks for this - you are probably right.

Current plan is a change of car December 2016 so I have 2 years to run, currently running at 16K miles over 14 months so another 20-24K planned miles possibly to recoup any investment. I did have a really bad dip in MPG last autumn which made me think something was off but no errors and it went back up again.

Might remap instead

When your doing comparison with other 2.7 TDi's are they non quattro cars?

A mix probably, I've paid more attention when people have quoted figures for a V6 Quattros both 2.7 and 3.0s as they will also be autos. Several places too, here and elsewhere. Several people have also suggested 40+ on a run, never been close to that in mine. Maybe I'm getting the wrong end of the stick ?

PS Click on my fuelly below, highest ever was 38 but that was a while ago (October 2013) and not been consistantly close since.

[Peter D]

What model of car, engine code, gear box, tyre size and make. Regards Peter

[gupsterg]

PS Click on my fuelly below, highest ever was 38 but that was a while ago (October 2013) and not been consistantly close since.

My fuelly account , if you sort it by average MPG best result was 3mths before injector change and the 3rd best is also with the chocolate injectors. This was driving it like a complete nun and knowingly trying to get best MPG. All other 8 results on that page are the new injectors and not knowingly trying to attain best MPG.

Now if I look at my annual report you can see 2012 (old inj) vs 2013 (new inj) average MPG not any better. Comparing years average mpg of 2013 vs 2014 I have a 3.5 MPG increase (14.5%) why? the car started to be used more on m-way and move to countryside meant my non m-way driving is not sitting in traffic.

When browsing on fuelly there's one 2011 3.0 TDi Avant yearly his figures are 28.5 / 33.4 / 30.1 , then in Jan 15 he stops updates either he's sold car or was depressed looking at the erratic curve and thought I'm stopping this! LOL

37mpg is only reported by the lone 3.0 TDi Manual owner in the 2010 section, no 2009's, 2008 we got 1 chap 24.9mpg (3.0 TDi Auto Saloon) and our very own Chris 30.8mpg (3.0 TDi Manual Saloon). 2007 section an Avant 3.0 Auto 27.8mpg , mmulla location london 21.4mpg and there's the Italian stallion with a 3.0 Saloon getting 36mpg but states 95% m-way.

In 2006 section theirs you , Rosscow @ 31.8mpg manual avant and last chap 28.1 mpg.

In 2005 section 33.8 / 25.9 / 25.7 / 30.3 / 39.2 , looking at dates and miles done the member with 39.2mpg must have done lots of m-way.

To me about 30 mpg real world is about average and only peeps which cherry V6's or very good driving habit / conditions reach higher. I agree the sample data is not big enough on fuelly to be conclusive and lack of 2.7 TDi's but gives a good idea on the V6 TDi.

[msh]

Hi there,

I think the fuel economy of this 2.7 tdi is very poor. i have got a 3.2 FSI Quattro and I am getting an average figure of 26 MPG with a best of 33 MPG on a long run. This is also worked out on Fuelly.

I cant see the point on having a diesel if the MPG is low !