91 RON or 95 RON fuel?

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snoopy42 - 22 Aug 2005 09:50 GMT

hi guys,

will it make any difference to fuel consumption and power using 95 RON fuel
against 91 RON fuel in a 89 240 or am i wasting my $$$ usung the higher RON
fuel?

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rastlouis@rogers.com - 22 Aug 2005 14:31 GMT

I bought a 92 240 wagon a month ago, and the mechanic who maintained it
said I should just use regular (89) octane fuel in it. I have been
doing that and have had good results. 28mpg (imperial). Based on
that, I would think 95 octane to be a waste of money, especially at the
price of gas these days! (over $1/L in Canada).

> hi guys,
>
> will it make any difference to fuel consumption and power using 95 RON fuel
> against 91 RON fuel in a 89 240 or am i wasting my $$$ usung the higher RON
> fuel?

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Chuck Fiedler - 28 Aug 2005 00:37 GMT

More than one study has shown that using "regular" gas gives not
significantly different results than any other grade. Cars are now
computerized and they make adjustment for the grade of gas used.

Admittedly, using higher grades of gas speeds the flow of $ from your
pocket.

Chuck Fiedler

>hi guys,
>
>will it make any difference to fuel consumption and power using 95 RON fuel
>against 91 RON fuel in a 89 240 or am i wasting my $$$ usung the higher RON
>fuel?

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Bev A. Kupf - 28 Aug 2005 02:36 GMT

> More than one study has shown that using "regular" gas gives not
> significantly different results than any other grade. Cars are now
> computerized and they make adjustment for the grade of gas used.
>
> Admittedly, using higher grades of gas speeds the flow of $ from your
> pocket.

That is mostly correct. Many modern cars do retard ignition timing and
work adequately with regular gas. My experience is that turbo-charged
Volvos with modern engines ping with regular fuel.

Beverly

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Lloyd Wells - 28 Aug 2005 12:48 GMT

> More than one study has shown that using "regular" gas gives not
> significantly different results than any other grade. Cars are now
[quoted text clipped - 12 lines]
>>RON
>>fuel?

When I first got my '01 S-40 I kept records of my gas milage using different
grades of gas. While it ran just fine with regular and middle grade gas,
the gas mileage went down, compared to the recomended premium. After
figuring out the relative costs per mile, it turned out that running premium
was only costing me 2 or 3 cents more per gallon.

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