Fuel Consumption - Help or advice needed

Newbie Joined: Aug 13, 2004 Posts: 6

Hi Guys,
After wanting a 100, then an A6 for the last 15 years I finally get my hands on a nice A6 V6 TDi Avant, leather, Tiptronic, CC. Lovely!

However, I have been told by a couple of specialists that Ishould be getting sround 35-40 mpg. I'm averging 30-32 with a very light foot (Sold my Cosworth to buy this, as needed something less thirsty and was in danger of losing my licence, it was too much fun not to use it!)

Is this about right for the V6 & tiptroinc box? If not, anybody got any ideas?

Cheers

Doc

Posted: Sun Aug 15, 2004 6:42 pm

Hi Doc,
Sounds like a good find, I have the Tiptronic Avant 2.4 Petrol and the computer says 23 mpg on mixed driving round Cornwall, so 30 sounds great to me! You don't say what year the car,which TDI or what type of driving you're doing, but I'd say 30 -32 sounds right for town driving for a modern big diesel car. It's certainly better than you were getting from a cosworth, but if you are after ultimate fuel economy a smaller car might have been better Smile

Here are some figure I found for the 2 different power 2.5 TDi cars:

2.5TDI V6 155bhp diesel: 0-60 9.7 seconds; top speed 137mph; combined mpg 40.9; CO2 emissions 186g/km (Multitronic 186g/km); Emissions Category: EU 3.

2.5TDI V6 180bhp diesel: 0-60: 8.9 seconds; top speed: 137mph; combined mpg: 34.9; CO2 emissions: 219g/km (Tiptronic only); Emissions Category: EU 3.

and the TDi 1.9

1.9TDI PD 130bhp diesel: 0-60 10.2 seconds; top speed 127mph; combined mpg 49.6; CO2 emissions 154g/km (manual, but Multitronic will be similar); Emissions Category EU 3.

All found on the honejstjohn.co.uk site

TBH, I think you need to drive it for a bit longer and manually record your mileage and fuel usage before you condemn it as a thirsty car,the computer may not be giving an entirely accurate reading.

Newbie Joined: Aug 13, 2004 Posts: 6

Thanks for the info but sorry for leaving a few bits out.

Its a 99(S reg) 150 BHP, no computer, figures for fuel consumption gathered over 8k miles since April. Mainly Motorway, steady 70-75.

Its actually thirstier than my cossie! (2.9 24v V6 running on LPG, approx 17-19 mpg on LPG which = approx 34-38 petrol equivalent!) garage est of about 180-190 BHP, [ Down from petrol figure of 220]), sold it as the bodywork was starting to go bad.

From the figures you found, I guess I should be seeing better MPG than the 180 BHP output engine But I'm not, which is why I am concerend that all is not well.

Cheers

Posted: Mon Aug 16, 2004 6:14 pm

if it was a FWD you should get ca 35mpg or more with an easy right foot.
however Quattro hampers the figures. my figures were 28-33 on a 150bph avant quattro 6speed. my current Allroad tiptronic 180bph takes fairly steady 26-28 mpg. (not necessarely driving all that careful at present.)

the V6 diesel is known to not be that frugile.
for pure economy the 1.9 is much better as was the older straight 5 diesel(also 2.5ltr).

Newbie Joined: Aug 13, 2004 Posts: 6

It is 2WD, so I guess there is something amiss somewhere.

Any ideas where to start?

Doc

Posted: Wed Aug 18, 2004 10:25 pm

tyre pressure, brakes not free,
after that its a matter of checking engine and gearbox settings.
should your performance be scatchy or low the airflow meter may be at fault (a very common problem on th tdi V6) and easy to fix.
I woud definetely recommend an engine and computer setting check at a audi specialist

Newbie Joined: Jun 01, 2004 Posts: 4

well i do regular long distances in my 99 2.4 A6....normal driving to and from work no motoways will get 300miles out of a tank and about 23-25mpg average.

On a motoway run i will always get 30-33mpg out of it and normally 450 miles from a tank....

Went to somerset yesterday from woking....got 31mpg on the way down and 32.8mpg on the way back....

set that cruise ctrl at 80-85 mph and watch the MPG rise n rise!

Newbie Joined: Aug 13, 2004 Posts: 6

Thanks for the info, its up for sale right now, so if it doesn't go I'll have to get it checked out.

Cheers

Doc