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Re: miles/gallon guage?
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CarGuru > Technology > Re: miles/gallon guage? 25 January 2005 23:03:57
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Re: miles/gallon guage?

John G 23 January 2005 14:14:02
 
"William R. Watt" <ag384@FreeNet.Carl­eton.CA> wrote in message
news:csuofn$l31$1@t­heodyn.ncf.ca...>
Wondering if some electronic genius has figured how to combine a fuel> consumption sensor with the speedometer cable to produce a > instantaneous> miles per gallon display for the dashboard and make it available to > the> motoring public.>
Some models of GM products (and probably others Ford etc) in the
civilised antipodes have dislayed Litres/ 100 kilometres instantaneous
and average for more than 10 years and a further calculation of
Kilometres to empty based on the current consumption.
These figures are updated quite often.
Perhaps it is too difficult to translate these figures to the ancient
measurement systems used in the more backward parts of the world.
--
John G

Wot's Your Real Problem?


Add comment
William R. Watt 23 January 2005 19:38:10 [ permanent link ]
 
thanks for the information. sounds like a good idea.

The governement of Canada signed the Kyoto protocol committing us to
lowering CO2 emissions. I am not so sure that was very smart but I was
thinking a miles per gallon (liters per 100 kilometers is the official
measure here) guage would help drivers burn less fuel. I think drivers
would be more motivated by saving fuel costs than by the Kyoto agreement
but the results would be the same. Canadian government reps are down in
California right now studying what they do there for auto emission
control. (In reality they are down there to get some free sun on the backs
of the weary Canadian taxpayer since they could get all the info they need
by electronic communication.)




--
-------------------­--------------------­--------------------­-------------------
William R Watt National Capital FreeNet Ottawa's free community network
homepage: www.ncf.ca/~ag384/t­op.htm
warning: non-FreeNet email must have "notspam" in subject or it's returned
Add comment
Leon Corley 23 January 2005 19:44:19 [ permanent link ]
 for OBD2 systems --
http://www.scangaug­e.com/

I have one on my 2000 silverado.
I'm basically happy with it.
I beleieve the MPG calculations are a little optimistic.

regards,
Leon


William R. Watt wrote:> Wondering if some electronic genius has figured how to combine a fuel> consumption sensor with the speedometer cable to produce a instantaneous> miles per gallon display for the dashboard and make it available to the> motoring public.>
--> -------------------­--------------------­--------------------­------------------->­ William R Watt National Capital FreeNet Ottawa's free community network> homepage: www.ncf.ca/~ag384/t­op.htm > warning: non-FreeNet email must have "notspam" in subject or it's returned

Add comment
Daniel J. Stern 23 January 2005 20:18:37 [ permanent link ]
 On Sun, 23 Jan 2005, Richard wrote:
Hmmm, I have a friend who has a newer Lincoln, don't remember the model,> that does just that, built into the dash.

I've owned '91 and '92 Chrysler products with this function built into the
trip computer. But aftermarket add-ons are difficult-to-imposs­ible on
recent model cars, and I think that's what the original poster was after.
Add comment
Don Stauffer in Minneapolis 23 January 2005 20:25:14 [ permanent link ]
 Richard wrote:
Hmmm, I have a friend who has a newer Lincoln, don't remember the model,> that does just that, built into the dash.> I don't know how it is done, per se, but it does show mpg.>
Richard

Most of these units had/have a fuel flow sensor, and obtain distance or
speed from odometer. Distance divided by fuel flow in given time
interval gives avg mpg over that interval, instanteous (current) fuel
flow and speed can be used to compute instantaneous (current) mpg.
Add comment
Don Stauffer in Minneapolis 23 January 2005 20:32:09 [ permanent link ]
 The interesting thing about this is that so many of the 'tips' for
economy driving are myths. Biggest one is to use feather foot. Very
slight throttle opening is just as bad as too much throttle opening.
Optimum throttle opening during acceleration varies from engine to
engine, but used to be about 65-75 percent (point just before power
enrichening cut in). This was with carbureted engines. I am not sure
what point enrichening occurs with new EFI engines- it might be an even
higher percentage of throttle.

Spark ignition (in fact MOST IC) engines would get max economy at full
throttle if it were not for mixture enrichening for low manifold (high
Absolute) pressure. On the other hand, rpms are BAD for economy. So
keep foot down reasonably far, shift early.

Because EFI allows generation of torque at lower rpm without stuttering
or bucking, I find I can shift far earlier with my EFI engines than I
ever could with carburetor.

William R. Watt wrote:
thanks for the information. sounds like a good idea.>
The governement of Canada signed the Kyoto protocol committing us to> lowering CO2 emissions. I am not so sure that was very smart but I was> thinking a miles per gallon (liters per 100 kilometers is the official> measure here) guage would help drivers burn less fuel. I think drivers> would be more motivated by saving fuel costs than by the Kyoto agreement> but the results would be the same. Canadian government reps are down in> California right now studying what they do there for auto emission> control. (In reality they are down there to get some free sun on the backs> of the weary Canadian taxpayer since they could get all the info they need> by electronic communication.) >
--> -------------------­--------------------­--------------------­------------------->­ William R Watt National Capital FreeNet Ottawa's free community network> homepage: www.ncf.ca/~ag384/t­op.htm > warning: non-FreeNet email must have "notspam" in subject or it's returned
Add comment
Daniel J. Stern 23 January 2005 22:16:07 [ permanent link ]
 On Sun, 23 Jan 2005, Don Stauffer in Minneapolis wrote:
The interesting thing about this is that so many of the 'tips' for> economy driving are myths.

Not really, no. Some of them are outdated, but not many of the persistent
ones are "myths".
Biggest one is to use feather foot. Very slight throttle opening is> just as bad as too much throttle opening.

Incorrect. Jackrabbit starts and acceleration spikes are bad for fuel
economy, period. Whether the fuel system be carburetion or fuel injection,
there is a mechanism for significant enrichment of the mixture to cope
with sudden increases in demand. The harder and faster you mash the
accelerator, the greater the degree and the more prolonged is this
enrichment. Gradual acceleration greatly reduces the degree and duration
of demand-spike enrichment, improving fuel economy. And that's without
even considering power enrichment, which is also more pronounced and more
prolonged when the throttle is spiked than when it is opened gradually.
Optimum throttle opening during acceleration varies from engine to> engine, but used to be about 65-75 percent (point just before power> enrichening cut in).

Incorrect. Power enrichment, which is separate from load-spike enrichment,
was usually a function of manifold vacuum and/or airflow, not throttle
position. There were some carburetors in which power enrichment was
mechanically disabled *until* a certain throttle position had been
reached, but that's not the same thing you're incorrectly stating here.
I am not sure what point enrichening occurs with new EFI engines- it> might be an even higher percentage of throttle.

Power enrichment is still not primarily based on throttle position. Your
understanding is flawed.
EFI allows generation of torque at lower rpm without stuttering or> bucking

Doesn't.

Add comment
Ant 24 January 2005 22:06:45 [ permanent link ]
 William R. Watt wrote:> Wondering if some electronic genius has figured how to combine a fuel> consumption sensor with the speedometer cable to produce a
instantaneous> miles per gallon display for the dashboard and make it available to
motoring public

jcwhitney sells a mpg gauge that is claimed to work on 'all cars'

http://tinyurl.com/­547yk
anyone tried this? how does it install/work?

anthony

Add comment
Tcs 24 January 2005 23:44:53 [ permanent link ]
 On Mon, 24 Jan 2005 13:25:22 -0600, Lawrence Glickman <Lawrence_Glickman@­comcast.net> wrote:
I believe you. It is a rice boy gadget at best, and a distraction and>complete waste of money at worst.

There's no need for moronic racist slurs. Vacuum guage "economy
guages" were around before japanese cars were ever imported into the
states.
Add comment
Daniel J. Stern 24 January 2005 23:59:12 [ permanent link ]
 On Mon, 24 Jan 2005, ant wrote:
jcwhitney sells a mpg gauge that is claimed to work on 'all cars'>
http://tinyurl.com/­547yk> anyone tried this? how does it install/work?

Looks like nothing more than a vacuum gauge, to me.
Add comment
Lawrence Glickman 25 January 2005 00:05:39 [ permanent link ]
 On Mon, 24 Jan 2005 13:44:53 -0600, TCS
<The-Central-Scruti­nizer@p.o.b.o.x.com>­ wrote:
On Mon, 24 Jan 2005 13:25:22 -0600, Lawrence Glickman <Lawrence_Glickman@­comcast.net> wrote:>
I believe you. It is a rice boy gadget at best, and a distraction and>>complete waste of money at worst.>
There's no need for moronic racist slurs. Vacuum guage "economy >guages" were around before japanese cars were ever imported into the>states.

The epithet "Rice Boy" is not the racial slur it may sound like. It
refers to the car owners of any ethnic origin who modify their
Japanese or Korean car in certain tacky ways. Rice Boys are poseurs
who accessorize their car, (all too often a Honda), to make it look
fast, without actually trying to increase the performance.

Rice is;

A 'fartcan' aftermarket muffler with coffee can-sized chrome tip.

An elaborate spoiler like that excrescence on the back of some
Tiburons.

Having a tach with a shift light in an automatic.

A DOHC-VTEC sticker on a Civic HX

A Type-R badge when you haven't got a type R

Quick-blink turn signals

Clear tailight lights

Springs cut to lower the car for no other purpose than appearance

"Honda RULZ" decal covering half of rear window

Oversize wheels and tires just for show.

Lg

Add comment
Don Stauffer in Minneapolis 25 January 2005 18:35:13 [ permanent link ]
 Daniel J. Stern wrote:
On Mon, 24 Jan 2005, ant wrote:>
jcwhitney sells a mpg gauge that is claimed to work on 'all cars'>>
http://tinyurl.co­m/547yk>>anyone tried this? how does it install/work?>
Looks like nothing more than a vacuum gauge, to me.

Indeed, those have been around for at least fifty years, and WERE just
vacuum gauges.
Add comment
Finite Guy 25 January 2005 19:34:15 [ permanent link ]
 My wifes 2005 Ford Escape Limited has a readout fo Average MPG. I
haven't taken the time to figure oiut hoe it works. Anyone know how? I
think it is an average and not instantaneous and I'm not sure that it
measures flow through the fuel line. I do know that it appears to be
accurate. If I calculate my mpg at fill up, it seems to coincide with
the readout.


On 22 Jan 2005 23:43:51 GMT, ag384@FreeNet.Carle­ton.CA (William R.
Watt) wrote:
Wondering if some electronic genius has figured how to combine a fuel>consumption sensor with the speedometer cable to produce a instantaneous>miles­ per gallon display for the dashboard and make it available to the>motoring public.

Add comment
Finite Guy 25 January 2005 23:03:57 [ permanent link ]
 Sorry for all those typos on my last post. This lousey computer has a
tendency to produce typos.

\On Tue, 25 Jan 2005 15:34:15 GMT, Finite Guy
<finiteguynospam@ne­tscape.net> wrote:
My wifes 2005 Ford Escape Limited has a readout fo Average MPG. I>haven't taken the time to figure oiut hoe it works. Anyone know how? I>think it is an average and not instantaneous and I'm not sure that it>measures flow through the fuel line. I do know that it appears to be>accurate. If I calculate my mpg at fill up, it seems to coincide with>the readout. >
On 22 Jan 2005 23:43:51 GMT, ag384@FreeNet.Carle­ton.CA (William R.>Watt) wrote:>
Wondering if some electronic genius has figured how to combine a fuel>>consumption sensor with the speedometer cable to produce a instantaneous>>mile­s per gallon display for the dashboard and make it available to the>>motoring public.

Add comment
 

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