BMW: MPG Question 320i & 323i Coupe

"fbloogyudsr" <com> wrote in
news:supernews.com:
 

You are correct Floyd, I'm new to this newgroup and forgot about the
international audience.

I'm not quite sure what "top-posting" is, so I hope I have not done so.

-Bill

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On Mon, 18 Aug 2003 18:47:54 +0100, "Dori Schmetterling"
<co.uk> wrote:
 

Nasty multi-radical imperial system rearing its ugly head again...

Well established metric units would have eliminated the
miscomprehension here, namely if the original poster had referred to
"litres per hundred kilometres" instead of "miles per gallon". Of
course, try carving the decimetric stuff into three and four... but
we already know how enamored you are with the solution to *that*
particular problem, Dori.

I have observed that yank spec Bimmers (seen those on lots) are
equipped with imperial - well, mpg based anyway - fuel economy
gauges ("60 30 15 10 5 0"?), as opposed to the normal BMW decimetric
fuel consumption gage ("0 5 10 15 20 30").

--
ricardo, ex-euroslav vancouver bc canada
e-mail: remove spamfreezone to reply

yahoo.ca (Ricardo) writes: 

As a geeky engineer with a heavy math education those gauges fascinate
me.

Basically when the car is stopped you have a situation when no fuel is
being consumed and no distance is being covered, therefore consumption
is indeterminate as it would be 0/0 (in either system!) In the US spec
version, the needle goes to the max value (leftmost end, over 40 mpg
in my car) when off the throttle before coming to stop. Once the car
is at rest, the needle moves all the way to the right to the 0 mpg!
That bugs me no end. It's showing fuel consumption as a non-continuous
function and that certainly is not.

I assume the gas/distance gauge acts in a more sane way, just going
towards the left (minimum) when stopping and staying there.

--
Ignasi.
'90 325is

"Ignasi Palou-Rivera" <com> wrote in message
news:com... 

What! If the motor is running and the car is not moving, you the consumption
rate is 0 mpg. We don't know how many gallons it will eventually take to go
a mile, bue we know without question that we are going nowhere and consuming
gas while doing it.

The needle goes to over 40 mpg (actually it can go to 99.9 mpg on the OBC
display), because the vehicle is rolling along at some speed, and the
throttle is fully closed. The consumption rate at that time could easily
exceed 99.9 mpg, but it would demand that we could actually go 99.9 miles
without pushing the pedal again.

Fuel consumption is continuous as long as the engine is running. The
consumption rate may not be linear, but it is continuous. The only time fuel
is not being consumed is when the motor is off.

Actually I'd prefer km/l.

Much simpler for guys like me who like to estimate how far one can go with a
particular fuel volume...(and don't bother to tell me about 'distance left'
gauges; I have one of those in my trip computer.)

But what can I do when those ruddy Continentals set the tone...?

:-)
DAS
--
---
NB: To reply directly replace "nospam" with "schmetterling"
---
"Ricardo" <yahoo.ca> wrote in message
news:..
................................. 
...............................

"Jeff Strickland" <com> writes: 

I got it wrong before, but I don't think you got it right either. If
we are stopped it will take an infinite number of gallons to go one
mile, therefore what we have is 0/infinity mpg.
 

On E30s, at least mine, the maximum number displayed on the gauge is
40 mpg.
 

That's my point. Fuel consumption is a continuous function when the
engine is running, but its values are shown to have a discontinuity by
the US-spec gauge. It goes from infinity (max value) to 0 (min value)
when the car stops. Following your example, the fuel consumption would
go from 99.9 mpg (maximum) to zero (minimum) when stoppping. That's a
discontinuity.


--
Ignasi.
'90 325is

Ignasi Palou-Rivera wrote:
 

On my US spec E36, when I'm slowing to a stop with closed throttle, the gauge goes
from very high mileage ( > 40 mpg ) *smoothly* down to zero as the car comes to a
stop, and the fuel to maintain engine idle continues.

Seems like that's exactly what it should do - I don't see any discontinuity.

Frank
97 328

mandycan wrote:
 

Nope. If it were merely a vacuum gauge, then it would not change reading
while coasting at closed throttle, with the clutch disengaged, so the
engine is at idle, for example, as engine vacuum would be constant.

Frank