[s-cars] Interesting state re: fuel consumption

[J. Khang]

No spring where I am. :) And we only get 97 RON, not the recommended 98 RON. Before the change of coil packs, I managed 8.6 l/100km over a long distance at 75mph with air conditioning (it's always at least 90F outside after 10am) on Castrol SLX 0W30. I am certain that 8l/100km is achievable if I didn't have to use the air conditioning.
Jonathan
'97 S6

----- Original Message ----
From: Robert Myers <bob at chips-ur-s.com>
To: J. Khang <jhlk99 at yahoo.com>
Cc: s-car-list at audifans.com; Fred Munro <munrof at sympatico.ca>
Sent: Saturday, 10 May, 2008 10:02:34 PM
Subject: Re: [s-cars] Interesting state re: fuel consumption


Another possibility might be the annual spring reformulation for 
gasoline.  The percentage of oxygenated fuel is seasonally reduced 
which, in itself, leads to better fuel mileage.

Bob

At 09:28 AM 5/10/2008, J. Khang wrote:
>"Fred Munro" <munrof at sympatico.ca> wrote:
> > Even stranger economy point on my S6. No.5 coil finally bit the big one and
> > after I replaced it, I took a 400 km road trip to Toronto. Fuel economy was
> > 8 litres/100 km going down (~30 mpg) and exactly the same coming back. I've
> > never gotten fuel economy like that on either of my S cars. It seems to be
> > holding up in my daily commute as well. Can't figure that one out - must be
> > something wrong :). Kind of nice at these fuel prices though.
> >
> > Fred Munro
> > '97 S6
>
>This is actually not surprising because the coil packs are 
>deteriorating over time and the available firing voltage is 
>dropping. I expect that the spark kernel is getting weaker and a new 
>coil pack will make a difference by reducing misfires.
>I had two coil packs fail recently and replaced all five because I 
>didn't want to mess about with them again. Like you, I have observed 
>improved fuel consumption. The engine also runs slightly smoother 
>and there is more power.
>Jonathan
>'97 S6
>
>
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