Re: [ST] for Brett - fuel economy

["Joel Ashman" <ashmite@xxxxxxxxx>]

This is very interesting.  So I did some quick research on Thermal Expansion
of Gasoline.

It seems that Gasoline expands at a rate of 950x10^-6  (or 0.00095) change
in volume per 1 degree change in Celcius.  Given that, 5 gallons of gasoline
at ground temp (approx 12C or 55F for this example) would expand .41 Gallons
when heated to 100C (or 212F).  BTW, Gasoline ignites at 232C or 495F.  .4
Gallons for 5 Gallons is just under a 10% increase in volume.  Obviously,
100C fluid coming from a pump would be noticed right away as the handle and
tube would be too hot to hold.  Using more a more realistically achievable
temp of 38C or 100F, the rate of expansion would be .11 Gallon for 5
gallons. The trick is that it would only cool to 25C or 77F (depending on
your air temp) or a delta of .061 gallons.  This would mean that you'd get 5
gallons from the tank, but when it cooled, there would only be
4.939gallons.  This translates into a 3 mile loss in range given the
average of
50MPG

But, if you follow the math, Brett's statement about heating gas to near
explosive temps would hold the 20% line, roughly doubling 100C and 10%
expansion to 200C and 20% expansion.  It just seams that it would cost too
much in equipment and gasoline/natural gas/propane to heat the tanks or
pumps to that temp.  And, wouldn't the EPA like agency's notice that
equipment during their inspections?  It sound's kinda hoax-ish to me.

--Joel




On 4/16/06, brettwilson21@xxxxxxx <brettwilson21@xxxxxxx> wrote:
>
> Studies have been done on this in Australia and found that petrol is being
> sold at near explosive temps in some cases causing it to expand by as much
> as 20%.
>
> Simply put, its heated, so it expands and the volume goes up. You pay for
> 20 litres, but when it cools you may only have 19 litres. Admittedly, not
> much but it adds up and the suppliers are getting money for nothing.
>
> Brett.
>
> -----Original Message-----
> From: JUSTIN SHREAVES <wyckoffjustin@xxxxxxxxx>
> To: ST@xxxxxxxxxxxxxx
> Sent: Sun, 16 Apr 2006 16:30:32 -0700 (PDT)
> Subject: Re: [ST] for Brett - fuel economy
>
>
> I can say that thermal expansion would be a factor in fuel volume, as it
> is sold
> as a liquid measurement, and not weight. If anyone has realized that they
> get
> better fuel economy in the winters, it is due to this reason. More dense,
> more
> btu per cc, less required throttle. While it is a very small difference,
> it is
> there, and will mess up the whole chart.
>
> Justin
>
> Neil Lindsey <Neil.Lindsey@xxxxxxx> wrote:
> never heard of this before -- could you elaborate please?
>
> Neil
>
> ----- Original Message -----
> From:
>
> To:
> Sent: Sunday, April 16, 2006 1:11 PM
> Subject: Re: [ST] for Brett - fuel economy
>
>
> > Good question. I guess if you're going to do this whole fuel economy
> thing, its wise to remove as many variables as possible, especailly
> considering the common practice of selling fuel warm.
> >
>
>
>
>
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