Home » Public Forums » GMCnet » Re: [GMCnet] Mileage chart???
| Re: [GMCnet] Mileage chart??? [message #196842] |
Wed, 30 January 2013 09:50  |
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From reading data on speed vs mass, etc. the main thing to keep in mind is that what you're pulling has less to do with gas mileage than what you're trying to push out of the way with the vehicle being driven. The faster you go the more air you're trying to shove out of the way. That creates resistance. That resistance requires more energy to overcome.
I'm putting together a brief presentation on the subject based on solid information (data). I may have it done in time so apply for a spot at Dothan. When I'm done, Gene will be able to see it on a site enjoys visiting where most information is allowed to have a life in the wild.
Byrton
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Byron Songer
Full-timing to enjoy the USA
Former owner but still an admirer
GMC paint schemes at -
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| Re: [GMCnet] Mileage chart??? [message #196852 is a reply to message #196843] |
Wed, 30 January 2013 12:46  |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma: 0
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| Mr ERFisher wrote on Wed, 30 January 2013 10:44 |
My background makes me take data to the limits
If you slow down to 0 mph. Your gas mpg goes to infinity.
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Um no. I thinks you took it to the wrong limit!
Gas mileage goes to zero.
Even if you have the engine off.
Because the gas still evaporates and you have gone zero miles.
0 miles/non zero gallons = zero....
Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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| Re: [GMCnet] Mileage chart??? [message #196856 is a reply to message #196842] |
Wed, 30 January 2013 13:28 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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True dat. a C/D of (reported) .312 is awesome, but even so, .312 of the side of a barn ios still a pretty good brake in the wind.
--johnny
'76 23' transmode norris
'76 palm beach.
From: Byron Songer <bsonger@songerconsulting.net>
To: "gmclist@temp.gmcnet.org" <gmclist@temp.gmcnet.org>
Sent: Wednesday, January 30, 2013 10:59 AM
Subject: Re: [GMCnet] Mileage chart???
From reading data on speed vs mass, etc. the main thing to keep in mind is that what you're pulling has less to do with gas mileage than what you're trying to push out of the way with the vehicle being driven. The faster you go the more air you're trying to shove out of the way. That creates resistance. That resistance requires more energy to overcome.
I'm putting together a brief presentation on the subject based on solid information (data). I may have it done in time so apply for a spot at Dothan. When I'm done, Gene will be able to see it on a site enjoys visiting where most information is allowed to have a life in the wild.
Byrton
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] Mileage chart??? [message #196857 is a reply to message #196843] |
Wed, 30 January 2013 13:30 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
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Can't agree. When you hit zero, the engine is still running and burning fuel, producing zero distance. This will result in zero MPG will it not?
--johnny
'76 23' transmode norris
'76 palm beach
From: "mr.erfisher@gmail.com" <mr.erfisher@gmail.com>
To: "gmclist@temp.gmcnet.org" <gmclist@temp.gmcnet.org>
Sent: Wednesday, January 30, 2013 11:44 AM
Subject: Re: [GMCnet] Mileage chart???
My background makes me take data to the limits
If you slow down to 0 mph. Your gas mpg goes to infinity.
Beats 8. To. 10 ;)
Gene
FREE WIFI @ Mickey D
On Jan 30, 2013, at 7:59 AM, "Byron Songer" <bsonger@songerconsulting.net> wrote:
> From reading data on speed vs mass, etc. the main thing to keep in mind is that what you're pulling has less to do with gas mileage than what you're trying to push out of the way with the vehicle being driven. The faster you go the more air you're trying to shove out of the way. That creates resistance. That resistance requires more energy to overcome.
>
> I'm putting together a brief presentation on the subject based on solid information (data). I may have it done in time so apply for a spot at Dothan. When I'm done, Gene will be able to see it on a site enjoys visiting where most information is allowed to have a life in the wild.
>
> Byrton
>
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] Mileage chart??? [message #196859 is a reply to message #196857] |
Wed, 30 January 2013 13:34 |
jayrabe
Messages: 509
Registered: June 2009
Location: Portland, OR
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Effectively infinite mpg happens when you're coasting down a hill with EFI and all fuel flow stops but you're still moving. Jay Rabe 76 PB Portland, OR > Date: Wed, 30 Jan 2013 11:30:51 -0800
> From: jhbridges@ymail.com
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] Mileage chart???
>
> Can't agree. When you hit zero, the engine is still running and burning fuel, producing zero distance. This will result in zero MPG will it not?
>
> --johnny
> '76 23' transmode norris
> '76 palm beach
>
> From: "mr.erfisher@gmail.com" <mr.erfisher@gmail.com>
> To: "gmclist@temp.gmcnet.org" <gmclist@temp.gmcnet.org>
> Sent: Wednesday, January 30, 2013 11:44 AM
> Subject: Re: [GMCnet] Mileage chart???
>
> My background makes me take data to the limits
>
> If you slow down to 0 mph. Your gas mpg goes to infinity.
>
> Beats 8. To. 10 ;)
>
> Gene
> FREE WIFI @ Mickey D
>
>
>
>
>
> On Jan 30, 2013, at 7:59 AM, "Byron Songer" <bsonger@songerconsulting.net> wrote:
>
> > From reading data on speed vs mass, etc. the main thing to keep in mind is that what you're pulling has less to do with gas mileage than what you're trying to push out of the way with the vehicle being driven. The faster you go the more air you're trying to shove out of the way. That creates resistance. That resistance requires more energy to overcome.
> >
> > I'm putting together a brief presentation on the subject based on solid information (data). I may have it done in time so apply for a spot at Dothan. When I'm done, Gene will be able to see it on a site enjoys visiting where most information is allowed to have a life in the wild.
> >
> > Byrton
> >
> > _______________________________________________
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| Re: [GMCnet] Mileage chart??? [message #196893 is a reply to message #196890] |
Wed, 30 January 2013 20:59 |
kerry pinkerton
Messages: 2565
Registered: July 2012
Location: Harvest, Al
Karma: 15
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| Mike Miller wrote on Wed, 30 January 2013 20:50 |
...
The published C/D of .312 was measured on a model. (I think I read it was 1/8th scale, meaning the model was just over 3 feet long.) Something tells me that a smaller object would not get the same actual drag as a much larger object of the same shape.
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Back in the early 80s, I was the MIS director for a company in Tullahoma, TN, that made wind tunnel models for NASA. Really, REALLY precise (and expensive) model airplanes from mainly aluminum down to .0005 accuracy and instrumented with capillary tubes to measure pressure.
The trick in getting around the scale issue is the gasses they use in the tunnel. It was explained to me once by one of our engineers and about all I got out of it was "Don't sweat it...we've got it handled and the results will be dead on." I suspect now they just do it with math and computers to adjust for the size.
Btw, someone posted a link today to a model given to one of the GMC managers and the text said it was a 1/16 scale model and was used for the wind tunnel test. It was further noted that the model was very clean. No roof top units at all which would have a big impact of C/D.
If someone reminds me at a rally, I'll tell the story about the Chicken cannon test cell at Arnold AFB. Not relevant to GMCs at all.
Kerry Pinkerton - North Alabama
Had 5 over the years. Currently have a '06 Fleetwood Discovery 39L
[Updated on: Wed, 30 January 2013 21:00] Report message to a moderator |
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| Re: [GMCnet] Mileage chart??? [message #196907 is a reply to message #196893] |
Wed, 30 January 2013 21:42 |
Bruce Hart
Messages: 1501
Registered: October 2011
Location: La Grange, Wyoming
Karma: 5
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Kerry is that where they used frozen chickens?
If someone reminds me at a rally, I'll tell the story about the Chicken
cannon test cell at Arnold AFB. Not relevant to GMCs at all.
On Wed, Jan 30, 2013 at 7:59 PM, Kerry Pinkerton <Pinkertonk@mchsi.com>wrote:
>
>
> Mike Miller wrote on Wed, 30 January 2013 20:50
> > ...
> > The published C/D of .312 was measured on a model. (I think I read it
> was 1/8th scale, meaning the model was just over 3 feet long.) Something
> tells me that a smaller object would not get the same actual drag as a much
> larger object of the same shape.
>
>
> I was the MIS director for a company that made wind tunnel models for
> NASA. Really, REALLY precise (and expensive) model airplanes from mainly
> aluminum down to .0005 accuracy and instrumented with capillary tubes to
> measure pressure.
>
> The trick in getting around the scale issue is the gasses they use in the
> tunnel. It was explained to me once by one of our engineers and about all
> I got out of it was "Don't sweat it...we've got it handled and the results
> will be dead on." I suspect now they just do it with math and computers to
> adjust for the size.
>
> Btw, someone posted a link today to a model given to one of the GMC
> managers and the text said it was a 1/16 scale model and was used for the
> wind tunnel test. It was further noted that the model was very clean. No
> roof top units at all which would have a big impact of C/D.
>
> If someone reminds me at a rally, I'll tell the story about the Chicken
> cannon test cell at Arnold AFB. Not relevant to GMCs at all.
> --
> Kerry Pinkerton
>
> North Alabama, near Huntsville,
>
> 77 Eleganza II, "The Lady", 403CI, also a 76 Eleganza being re-bodied as
> an Art Deco car hauler
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--
Bruce Hart
1976 Palm Beach
Milliken, Co
GMC=Got More Class
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Bruce Hart
1976 Palm Beach
1977 28' Kingsley
La Grange, Wyoming
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| Re: [GMCnet] Mileage chart??? [message #196931 is a reply to message #196907] |
Thu, 31 January 2013 04:42 |
kerry pinkerton
Messages: 2565
Registered: July 2012
Location: Harvest, Al
Karma: 15
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Senior Member |
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| Bruce Hart wrote on Wed, 30 January 2013 21:42 |
Kerry is that where they used frozen chickens?...
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Once
Kerry Pinkerton - North Alabama
Had 5 over the years. Currently have a '06 Fleetwood Discovery 39L
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