[V6-12v] fuel efficiency

[Jonathan]

Hi James,

I was quoting in L/100km not mpg. 11.6L/100km is about 22.1mpg. 35mpg is 
6.7L/100km. That is a figure only reached with FSI engines. Infact I don't know 
about the rest of the world. But in Australia, about 20 of the 40 variants of 
Audi offered here have a fuel consumption less than 7L/100km (something to do 
with taxing) which Audi Australia has noted as a big achievement, so no way 
what was the big engine back then consumed that little fuel.

Cheers

Jon

On Fri, 22 May 2009 07:12:23 pm James Whitehouse wrote:
> Guys,
>
> Those of us in Europe where petrol (gas) is horribly expensive have, as Tom
> pointed out, been aware of the effects of car setup and driving style for
> years. I remember doing the 'coasting downhill' technique Tom describes
> when I owned my first Audi (generation 1 80 1.8 - great car, never let me
> down) because I was a student with little money. I was living in France as
> a student near Nice and on the autoroutes around there you have big hill
> climbs but then massive descents. Sometimes I could coast as fast downhill
> there as other people on power. Nowadays I drive reasonably sensibly, keep
> the engine in good condition and just suck up the cost of fuel. Tyre
> pressures make a huge difference also - I usually inflate all tyres to the
> high-load/high-speed setting (actually I use 36 psi all around unless I
> have a heavy load in the rear). This often improves handling and response
> in the wet anyway. Also remove any unneccessary weight from the car (in the
> boot (trunk), etc.).
>
> That said, the fuel economy of the 2.8 V6 at least is a heck of a lot
> higher than 10 mpg! It should be up to 35 mpg for an engine in good
> condition on a long run (motorway/highway) and in the high 20s for
> town/urban driving. If it's down in the 10s I'd say you have either a very
> very heavy right foot, or some kind of problem with the engine
> mechanically, or with engine management, or you're using the wrong grade of
> fuel (Super unleaded costs more, but gives better power/economy).
> Definitely give the engine a good service and health check, definitely
> check lambda (O2) probes - when they go bad they can read too lean and
> cause the engine to over enrich, wasting fuel and coking up the engine.
>
> Regards,
> James
>
> --- On Wed, 20/5/09, Tom Christiansen <tomchr at gmail.com> wrote:
>
> From: Tom Christiansen <tomchr at gmail.com>
> Subject: Re: [V6-12v] fuel efficiency
> To: "Jonathan" <jhhummel at bigpond.com>
> Cc: v6-12v at audifans.com
> Date: Wednesday, 20 May, 2009, 2:00 PM
>
> Jonathan,
>
> There are a lot of factors that affect fuel economy. How much you are
> hauling, tire pressure, etc. But foremost probably your driving habits and
> type of driving.
>
> On my 1994 90S that I parted with last year I had about 170000 miles
> (272000 km) on it. I consistently got 25-26 MPG (10.9 km/l or 9.2 l/100km).
> Last summer, when gas was less cheap, I changed my driving habits. Rather
> than driving 70 MPH on the highway, I stuck to the posted speed limit of 60
> MPH. That gave another 10-15 % fuel savings. Inspired by some fuel economy
> contest in Europe, I also started coasting downhill. Just step on the
> clutch and coast - if you need power to steer around something all you have
> to do is pop the clutch and it's here... That gave 0-10 % improvement. But
> frankly, it was a bit of a pain and the results were very inconsistent. It
> did lead to a change in my driving style, though. On the routes I take
> regularly, I now coast down even seemingly negligible slopes while
> maintaining a constant speed (gravity at work). And I stick to the posted
> speed limit. I avoid rapid starts. For the most part anyway... Every once
> in a while you gotta have some fun and floor it... :-)
>
> My driving is about 60/40 between highway/city driving. Before I parted
> with the 90S, I seem to recall getting 27-28 MPG.
>
> So in short; I don't think fuel economy is a good gauge for how the engine
> is fairing. I'd keep an eye of it and analyze changes. But oil consumption
> has for me been a better indicator.
>
> ~ Tom
>
> On Wed, May 20, 2009 at 2:20 AM, Jonathan <jhhummel at bigpond.com> wrote:
> > Hey All,
> >
> > Just worked out my fuel efficiency last fill up - just cause really.
> > Anyway, it
> > works out to be about 11.6L/100Km. It's official ecconomy is about 10
> > something
> > isn't it?
> > Anyway, to my point. Is fuel economy a reasonable measure of how your
> > engine
> > is fairing? As in, that's not bad for a 13yr old engine that has done
> > 265000Km.
> >
> > Car:
> > 9 6A4
> > 2.6 V6
> > 5spd Auto, front wheel drive.
> >
> > Cheers
> >
> > Jon
> > _______________________________________________
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> > V6-12v at audifans.com
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>
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