[AT] OT: Gas story

[Larry D Goss]

Right on, Ken.  My drinking buddy (coffee at McDonald's with a PhD in 
Chemistry) and I have been laughing about this thread for the last week. 
You're right. A 1% difference in volume is about the most you could expect 
under the most adverse circumstances. But even those circumstances are not 
likely to occur.  If it was, those semi's full of gasoline would be 
exploding all over the place prior to delivery to the service stations 
(vapor pressure and all that jazz).

As for the difference in mileage from Flying J, you're going to find more 
differences in fuel consumption from the differences in additives than 
anything that is caused by a temperature change.  As my drinking buddy says, 
"When you add an alcohol to gasoline (regardless of the source) your gas 
mileage is going to go down because there are fewer BTU's per gallon."

Now the question is: Do you trust a drinking buddy?  :-)

FWIW, I got 18.9 MPG last week on a two-day trip across country in my Jeep 
while towing a loaded trailer at turnpike speeds.  I used Flying J unleaded 
regular all the way.  I don't feel like I have anything to complain about 
with that record.

Larry

----- Original Message ----- 
From: "Ken Knierim" <ken.knierim at gmail.com>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Monday, July 02, 2007 2:38 PM
Subject: Re: [AT] OT: Gas story


> The numbers I'm hearing here in AZ are somewhere around 1% of the
> volume of the fuel (I think 231 versus 234 cubic inches once the
> temperature has been normalized). Hard to believe anyone has fuel
> economy plotted that accurately on a commuter vehicle, but with $3
> fuel that's 3 cents a gallon or so. Probably enough that the station
> makes a few cents per gallon and the unsuspecting customers don't
> notice it. Funny how there are stations in Canada that have it
> corrected for temperature where it is colder than the calibration
> standard but there aren't any of those here where the temperature
> might be warmer.
>
> There's been several articles locally about this and the AZ
> legislature was considering doing something about this recently.
> Wouldn't be surprised if the lobbyists caught wind of it and made
> their pitch; I don't think anything is happening on it now.
>
> Ken in AZ
>
>
>
> On 7/2/07, George Willer <gwill at gwill.net> wrote:
>> Some folks completely miss the point.  It's the temperature of the gas 
>> when
>> it's metered through the gas pump at the station that makes the 
>> difference.
>> The gas that's expanded because it's warmer when it's measured and sold 
>> is
>> the point.  You're paying for slightly more than you're actually getting. 
>> I
>> doubt the difference that's claimed is as large as stated, but there's a
>> difference anyway.
>>
>> George Willer
>>
>> > Subject: Re: [AT] OT: Gas story
>> >
>> > When you put the cold fuel in your hot tank sitting in the sun 
>> > alongside
>> > the Mack doesn't it get warmer.
>> > I can't believe that anybody would believe that the temperature of the
>> > fuel would make difference. If its gasoline its preheated before it go
>> > into the Carb. If its diesel it preheated in the manifold same as fuel
>> > injected cars.
>> >
>> > Ron
>>
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