[AT] OT: Gas story

william.neff.powell at comcast.net william.neff.powell at comcast.net
Mon Jul 2 03:25:55 PDT 2007


The temperature of the fuel as enters the engine may not make a difference, the difference is the volume when it is sitting in the tank. I remember watching a story on Formula one racing in Europe. All of the well funded teams had fuel refrigeration  units in the pits. The cooler the fuel, the more they could get into their tank.

Found this content on the net: 

"Here is how selling hot fuel bilks consumers: Gasoline or diesel stored at the pump under higher temperatures behaves like all liquids – it expands. But the amount of energy per volume stays the same, and U.S. gas stations do not adjust their measurements at the pump to take into account this change.

Consequently, consumers receive less energy per gallon than they’ve paid for when they unwittingly purchase gas that is warmer than the national standard.

For example, if motorists fill their 20-gallon gas tank on a hot day when the fuel temperature reaches 90 degrees, they are being shortchanged the energy equivalent of more than a third of a gallon. The cost translates to a few cents per gallon, which becomes significant over longer periods of time, particularly in the summer months when there is increased driving in hotter temperatures and gas prices are highest."

source  = http://www.citizen.org/pressroom/release.cfm?ID=2337

 -------------- Original message ----------------------
From: Cecil Bearden <crbearden at copper.net>
> I really do not think the tank temp of the fuel makes all that much 
> difference.  In fact, there are mileage increase claims made by wrapping 
> the fuel line around a heater hose before it goes into the injection 
> pump.  But I do notice a difference in the mileage with Flying J fuel.
> 
> Cecil in OKla
> 
> RonMyers at wildblue.net wrote:
> > 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
> >
> >
> >
> >   
> >> I have also noticed that Flying J fuel is cheaper, but I don't get the
> >> mileage out of it...
> >>
> >> Cecil in OKla
> >>
> >> Mike Sloane wrote:
> >>     
> >>> The "downside" of the "mom & pop" places is that it is more likely that
> >>> the fuel has been sitting there a while and has accumulated more
> >>> moisture and "crud". I would say that a station that gets deliveries
> >>> once or twice a week is probably your best bet - the gas sits there long
> >>> enough to cool down but not long enough to get "stale". And if you see a
> >>> delivery truck in the driveway, find another station - when the fuel
> >>> drops out of the tanker, it comes out very, very fast, and it stirs up
> >>> all the junk in the underground tank. It all usually settles in an hour
> >>> or two, so you can probably come back later and fill up with no problem.
> >>>
> >>> At least that's how it was at my station. I used to request night
> >>> deliveries to avoid all of those problems, and the delivery company
> >>> didn't seem to mind at all.
> >>>
> >>> Mike
> >>>
> >>>
> >>>
> >>> Danny Tabor wrote:
> >>>
> >>>       
> >>>>         It wasn't until I got fuel some place else did
> >>>> I realize our local Flying J was ripping me off. With
> >>>> the "J" fuel I was just barely getting 5 MPG's then I
> >>>> stopped at little local place and with their fuel I
> >>>> got better than 6 out of my Mack. Same thing with
> >>>> other fuel stops, then back to Flying J and a dramatic
> >>>> decrease again.
> >>>>         I'm certain its because the Flying J goes
> >>>> through so much fuel (1 or 2 tankers there almost
> >>>> constantly delivering) that the fuel doesn't sit long
> >>>> enough to cool down. Now I try to stay clear from big
> >>>> truck stops and get my fuel from little stores or mom
> >>>> and pop shops. Even though often Flying J's prices are
> >>>> a few cents less than smaller stores. After the fuels
> >>>> pumped and the mileage is figured in I'm not saving
> >>>> anything by getting fuel from them.
> >>>>
> >>>> Danny Tabor
> >>>>
> >>>>
> >>>>         
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> >>>
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