MPG - not that good.

At least you dont own a S3 ...........

Is it still relatively low mileage? These diesels seem to "loosen up" and give better MPG after 20,000 miles or so. I've heard loads of people complaining about disappointing MPG on new(er) Audi 2.0 diesels. My son had a new 2.0TDI TT for a while and was getting nowhere near what I was getting in my similar engine (80,000 miles) car.

Mates A5 2.0tdi Manual can get 71.2mpg on motorway. This was when it was brand new. It's the new shape one. Around town they aren't so good. But this is the same story with any diesel. I have a 118D that does 38mpg around town but have managed over 72 on a motorway run.

Also. Maybe your VRS has a lot more torque. So less fuel used when accelerating at same speed compared to your A3.

My TDI S-Line averages about 52 on combined motorway/city driving but on a long motorway run I've had it up in the 70's.

Mine isn't quattro but I've been getting 60-65 MPG recently

My 13 plate A5 Tdi 177 isnt great...combined average with fuelly app is barely 40mpg & thats with a DTUK BOX fitted

Pfffft... Miles per gallon? I only start worrying about it when it becomes gallons per mile...

A few more serious points though;

-Low power engine options are often not the best way to get acceptable economy. Yes, a low power engine will get a squillion mpg, but only under very particular circumstances and with a very particular driving style akin to that of one of those cretinous hyper-miling Uber drivers that's dead set on squeezing 100mpg out of his million mile old Prius, and tough luck if you happen to be behind him. Drive it in a manner where it delivers acceptable pace and acceleration though, and the eco figures will tumble. Drive an engine with a bit more muscle at similar pace, and you'll probably find its 'real world' economy more to your liking. This one reason is I suspect why my 73 bhp Polo gets very similar mpg for the same journey as my S3, despite its being much smaller, a quarter of a tonne lighter, only 2wd, and fitted with a non-turbo engine 2/3s of the size and with less than a quarter of the power.

-Quattro. Fantastic in slippery conditions, but the rest of the time it's a parasitic load on the engine and a whole lot of extra weight to haul around. Pulling the fuse on my old Haldex equipped Mazda would give an instant 2 to 3 mpg improvement, which shows just how much work at the engine is 'lost' as heat, noise and tyre scrub when driving all four wheels. I imagine removing the surplus transfer box, propshaft, torque coupling unit diff and driveshafts would have that improve still further, although it would have limited practicality somewhat...

-The mpg reading on the DIS. It's often a work of fiction I'm afraid. Make sure you calculate it the old fashioned way by dividing up the number of miles you've covered by the gallons you've poured in the tank. The fact that you can adjust the mpg meter to read higher or lower with VCDS tells you everything you need to know about relying on the DIS and using its reading to compare between cars.

-Last thing. This is a VAG diesel. Of course it's not as economical as you thought it would be...

Fatbloke said:

Hi All

Just checked the MPG on my 2016 A3 S-Line Quattro TDI 150 for the first time. Not that impressive.

The calculated average was just over 44mpg. I was hoping it would be better.

I also have a Skoda VRS CR with just over 200 bhp and it gets mid to high 40's normally running about and low 50's on a run.

What are others getting with their A3 150 Quattro??

Cheers

Dave

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Yep, sounds similar to my 184 TDI Quattro.

TDI-line said:

Yep, sounds similar to my 184 TDI Quattro.

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Mine is much the same .According to the long term mpg setting on my TDI-184 Quattro which I have not zeroed since new (now 6000+ miles) my average mpg for all my driving is 45mpg. Personally I'm not that bothered about mpg. If I was I would not have purchased a 184 Quattro.

Yeah the 184 quattro is quite a powerful car, especially for overtaking. For the performance the mpg isn't too bad! Had one as a courtesy car and found it so easy to drive!

S3 returned 45mpg on a run back from Dorset a couple of weeks ago.

Mostly 50mph speed zones and then a nice bit of motorway at 70 mph.

Long term average (11k miles across a year) is showing as 36mpg.

Not too shabby.

holmefield said:

My 13 plate A5 Tdi 177 isnt great...combined average with fuelly app is barely 40mpg & thats with a DTUK BOX fitted

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Would you expect a tuning box to improve mpg?

KenL said:

Would you expect a tuning box to improve mpg?

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Not if it improves the performance. More performance usually means more fuel used.

h5djr said:

Not if it improves the performance. More performance usually means more fuel used.

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Err... sometimes yes, sometimes (surprisingly) no...

Performance is of course limited by the Mega Joules (MJ) of chemical energy we put into the engine, and more fuel does definitely equal more MJ. The odd thing about re-mapping though is that at least some of the gains come from improving the efficiency of the conversion from MJ in the tank to kW at the crank. When giving it the full beans and extracting 350 / 400/ 900 / whatever fantasy figure bhp you want at wide open throttle, you'll undoubtedly suffer a bit more of a penalty in mpg, but in the general day to day driving about and obeying speed limits and traffic lights area where we spend the other 95% of our driving time, the fine tuning may well give you an increase in heat rate (chemical energy converted to usable power at the wheels, and therefore, better mpg...

Still seems like witchcraft, but it is definitely possible and regularly happens. I had a couple of Toyotas mapped many years ago, and they definitely used less fuel afterwards.

Fatbloke said:

Used half a tank away for a weekend break up in the highlands. 49.66 mpg. Still room for improvement but it may get better once the engine loosens off a bit.

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Hope you had a good time in the Highlands


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