[s-cars] Interesting state re: fuel consumption

[calvinlc at earthlink.net]

Yeah, but 30mpg?  Holy cow.  The best I have ever seen in a roundtrip is 27
and that was 2 better than I usually would get when the car is in peak
tune....I would love to know how we get such wildly varying figures of gas
mileage...I know the drivers are different but on a highway run, if we are
all going a similar speed (70-80mph) I would think we would see within 1-2
mpg of each other, yet there seems to be variances from 20mpg to
30mpg...that is a HUGE variance.
--Calvin


-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com]On Behalf Of J. Khang
Sent: Saturday, May 10, 2008 7:28 AM
To: s-car-list at audifans.com; Fred Munro
Subject: Re: [s-cars] Interesting state re: fuel consumption


"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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