Fuel prices-BTU's per Gal.

On Thu, 31 May 2007 10:56:21 -0500, Barnyard BOb
wrote:


Jerry Wass wrote:


Doing the simplest conversion---168.3/250.0--= sp.gr.of 0.6732..

0.6732X 8.34(#/gal for h2o)= 5.614 #/gal for Avgas--agreeing with
you--but isn't right---I'm gonna weigh things again--might have been off
on my tare weight. Jerry
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I don't keep avgas at my house. However....

Weighing 250 cc of 60 degree F. mogas = 190 grams

Specific gravity = 190/250cc = 0.76

0.76 x 8.34 = 6.3384....

MOGAS = 6.3384 lb/gal @ 60 degrees F.

More than close enough for GW Bush gov't work!

A more relevant number is the BTUs per gallon which translaes into MPG
for a given engine.

Automotive gas in California is about 111,500 BTU while E85 is about
81,000, or 72% Straight Ethenol is roughtly 60% or 66,600 BTU.
Alcohol costs more while giving much less energy and MPG. IOW just
going from straight gas to E85 a trip that takes 50 gallons of gas
will take at least 69.5 gallons of E85.
Given todays car gas prices of basically $3.20 per gallon (it's near
$3.50 in michigan) if we take that 50 gallons of gas for a trip at
$3.50 it's 175 USD. Given the same price for E85 (which is actually
more expensive) we come up with $243.25, or an extra $68.25 for the
same trip using E85.

Alternative fuels are in general more expensive to use or implement
than gas. For those fuels to become viable alternatives the cost of
gas is going ot need to go to at least $3.50 a gallon and stay there.

Except for small scale implementation, Hydrogen is much more
expensive.

I spent some time with a consulatant a couple weeks back. His
conclusion for me to go a combination of active and passive solar
power would easily run bet ween $30,000 and $50,000 for this small
home. Yes, I could sell power back to the power company, BUT our rates
are about 8 cents per KWH whichmakes for a very long pay back if I
don't have to purchase any power. Add to that, maintenance on the
syatem and it really starts to get expensive.

"Roger (K8RI)" wrote:


MOGAS = 6.3384 lb/gal @ 60 degrees F.

More than close enough for GW Bush gov't work!

A more relevant number is the BTUs per gallon which translaes into MPG
for a given engine.
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Roger,
You are very, very late to this party.

Btu/gal is not only old news, if you follow this thread back....
but of no interest to the 'victims' beating this horse dead!

Sorry. 8-)



- Barnyard Bob - lord luva duck

On Sat, 02 Jun 2007 01:00:31 -0500, Barnyard BOb
wrote:


"Roger (K8RI)" wrote:


MOGAS = 6.3384 lb/gal @ 60 degrees F.

More than close enough for GW Bush gov't work!

A more relevant number is the BTUs per gallon which translaes into MPG
for a given engine.
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Roger,
You are very, very late to this party.

Btu/gal is not only old news, if you follow this thread back....
but of no interest to the 'victims' beating this horse dead!

I've been following the thread Bob, but the only thing I could find
relevant is energy per unit. The only time I care about weight or spg
is when figuring out how much I can carry. :-0)


Sorry. 8-)



- Barnyard Bob - lord luva duck

"Roger (K8RI)" wrote:

Barnyard BOb wrote:


"Roger (K8RI)" wrote:

A more relevant number is the BTUs per gallon which translaes into MPG
for a given engine.
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Roger,
You are very, very late to this party.

I've been following the thread Bob, but the only thing I could find
relevant is energy per unit. The only time I care about weight or spg
is when figuring out how much I can carry. :-0)

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Hi Roger,

Do these old posts of mine not address your topic of concern?

-------------

MAY 29, 2007

From Wikipedia, the free encyclopedia:

Energy content

Gasoline contains about 34.6 megajoules per litre (MJ/l) or 131 MJ/US
gallon. This is an average, gasoline blends differ, therefore actual
energy content varies from season to season and from batch to batch,
as much as 4% more or less than the average, according to the US EPA.


Fuel type BTU/US gal Research octane

Regular Gasoline 125,000 Min 91
Aviation gasoline 120,200


BTU/US gal
Gasohol (10% ethanol + 90% gasoline) 120,900
( Research octane) 93/94


- Barnyard BOb -

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MAY 29, 2007

Peter,
After reading your earlier post and having held similar views for
many years, I thought something like this might be of interest.

FWIW, my rule of thumb...
The cruder the fuel, the more btu/gal.
i.e., diesel blows away gasoline @ 138,700 btu/gal
Jet Fuel: Kerosene* 125,800 btu/gal

*Chevron Products Company 2000


- Barnyard BOb - the devil's in the details


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MAY29, 2007

Jerry,
Your ORIGINAL ARGUEMENT WAS....

"Hate to disagree. but there are more BYU's in a GALLON of Avgas than
in a GALLON of Mogas. Why?? Avgas weighs more per Gallon..."

Weight of fuel is irrelevant when it comes to btu/gal....
assuming your BYU reference was meant to be btu.
Btu/gal is a VOLUME measurement, not one of weight.

Thank you for your time and patience.

- Barnyard BOb -
Jerry,
Your ORIGINAL ARGUEMENT WAS....

"Hate to disagree. but there are more BYU's in a GALLON of Avgas than
in a GALLON of Mogas. Why?? Avgas weighs more per Gallon..."

Weight of fuel is irrelevant when it comes to btu/gal....
assuming your BYU reference was meant to be btu.
Btu/gal is a VOLUME measurement, not one of weight.

Thank you for your time and patience.

- Barnyard BOb -
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
MAY 29, 2007

Jerry,
I have purposely distanced myself from weight specifics
since my sources state energy content BY VOLUME,
which is the convenient way we buy fuel at the pump.

Found another web site stating values by GALLON, not weight.
[No idea how accurate these values are.]
http://www.jwiwood.com/faq/conversion.html
Too bad they make no reference to avgas.

For grins.....

1 gallon of crude oil ... 138,095 Btu
1 gallon of kerosene or light distillate oil ... 135,000 Btu
1 gallon middle distillate or diesel fuel oil ... 138,690 Btu
1 gallon residential fuel oil ... 149,690 Btu
1 gallon of gasoline ... 125,000 Btu
1 gallon of ethanol ... 84,400 Btu

P.S.
If these figures are reasonably accurate...
It takes MORE than a gallon of crude to produce a gallon of diesel.
Double ditto for residential fuel oil.


- Barnyard BOb -

On Sat, 02 Jun 2007 16:23:53 -0500, Barnyard BOb
wrote:


"Roger (K8RI)" wrote:

Barnyard BOb wrote:


"Roger (K8RI)" wrote:

A more relevant number is the BTUs per gallon which translaes into MPG
for a given engine.
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Roger,
You are very, very late to this party.

I've been following the thread Bob, but the only thing I could find
relevant is energy per unit. The only time I care about weight or spg
is when figuring out how much I can carry. :-0)

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Hi Roger,

Do these old posts of mine not address your topic of concern?

Not tht I can find.
I was addressing the energy content in pure Methenol and E85 compared
to gas. Near as I can tell, the rest of the thread compared Gasahol
(10% alcohol), avgas, car gas, and kerosean, or did I miss something?
I rememember I did make a mistake one time:-))