On Jul 30, 7:51=A0am, "Mortimer" <m...@[EMAIL PROTECTED]
> wrote:
> "Retired VIP" <jackj.extradots....@[EMAIL PROTECTED]
> wrote in message
>
> news:6bj0945krobtl9il2go8jqu933eun13q5n@[EMAIL PROTECTED]
>
>
>
>
>
> > On Tue, 29 Jul 2008 21:17:58 -0700 (PDT), coachros...@[EMAIL PROTECTED]
> > wrote:
>
> >>On Jul 29, 7:13 am, "Elmo P. Shagnasty" <el...@[EMAIL PROTECTED]
>
> >>wrote:
> >>> In article <488ef841$0$4014$bbae4...@[EMAIL PROTECTED]
>,
> >>> Fat Moe <Fat...@[EMAIL PROTECTED]
> wrote:
>
> >>> > As far as getting extra mileage with
> >>> > higher octane? I don't buy it,
>
> >>> Octane is not the issue. Cleanliness of the fuel injectors and
intake
> >>> valves and combustion chambers is the issue.
> >>I've had my 98 Pontiac Grand Prix GTP for a little over ten years now,
> >>and follow the gas mileage carefully. Using 92 octane, I will get a
> >>full mile per gallon better than using mid-grade. Using 87 octane will
> >>cost me 3-4 mpg, so it costs me a LOT more by using the cheaper
> >>gasoline. The difference in acceleration is very noticeable as well.
>
> I'm interested that you say you get "a full mile per gallon better".
That
> suggests that you normally get results which are consistent to within a
> fraction of an mpg, such that a difference between fuels is
significantly
> greater than the difference between successive tank-fillings on the same
> fuel.
>
When I say "a full mile per gallon better ", I mean that driving under
the same type driving conditons, speed, weather, pay load, highway or
city, air conditoner use, etc if I drive the SAME way, I will get one
mile per gallon better on a consistent basis. Have done so for years.
Maybe not a noticeable difference, but the higher octane gasoline is
better for my particular automobile.
> My experience, with both petrol and diesel cars, is that the variation
> between one tank filling and another is about +/- 3 mpg, depending on
> factors such as the type of driving (mainly urban / mainly high-speed /
s=
ome
> mixture of the two) and different points that different fuel pumps cut
of=
f
> when they sense that the tank is full.
>
Of course, if I am driving 85 on the interstate, I will get less
mileage than if I am cruising at 70 (which is the speed I usually use
to test my gas mileage), even less if I slow down to 65 or so.
> My figures are for filling the car to the pump cut-off point and then
> running it until the tank is fairly low - typically for fillings of
about=
50
> litres (11 gallons UK / 13.5 gallons US) and journeys of around 550-650
> miles.
>
I use my car's on board mileage calculator, which I have tested and
found to be extremely reliable.
> I've noticed a difference in the smoothness of the engine and the
> acceleration between supermarket diesel and BP Ultimate diesel, though
so=
me
> of this could be wishful thinking to compensate for the extra cost of BP
> Ultimate - when you pay gold-plated prices maybe your brain thinks it
can
> see extra gold-plated performance!- Hide quoted text -
>
I feel the same way about using Shell's Premium. My car runs a little
better on it than on other brands. (At least I THINIK it does!)
> - Show quoted text -
|
