Re: More on Top Tier gasoline

On Tue, 29 Jul 2008 21:17:58 -0700 (PDT), coachrose13@[EMAIL PROTECTED]
>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.
>
>
>Of course, with the 3.8 supercharged engine, the owners manual states
>that premium unleaded is required, and I can see why.

Well of course you'll get better mileage using the grade of gasoline
recommended by the manufacturer.  That's a given.  There are a lot of
reasons why this is true and almost all have to do with pre-ignition,
not with the additive package.  In most cases, the premium grade will
have the exact same package as the regular grade.
>
>Based on these experiences I would not even consider running anything
>other than premium in my Trans Am.
>
>
>I am curious as to what, if any, difference that running premium in my
>06 GP (3.8 not supercharged) would make. I have only used 87 octane
>since I bought it two years ago.

Using a grade of gasoline that is above the manufacturer's
recommendation is a waste of money.  The manufacturer knows what his
product was designed to do and what it's requirements are.  You should
follow his recommendations.

Jack