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From: Jolly Roger <jollyroger@pobox.com>
Newsgroups: comp.sys.mac.system
Subject: Re: [OT] I won!
Date: 25 Aug 2015 01:10:32 GMT
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On 2015-08-24, John Varela <newlamps@verizon.net> wrote:
> On Sun, 23 Aug 2015 15:18:57 UTC, JF Mezei 
><jfmezei.spamnot@vaxination.ca> wrote:
>
>> On 15-08-23 00:33, Michelle Steiner wrote:
>> 
>> >> The last paragraph makes no sense.
>> > 
>> > Consider the author.
>> 
>> 
>> If you had listened to the programme in whole you would have understood.
>> Modern engines constantly adjust fuel/air flow and timing of ignition
>> based on needed performance. So whether you use normal or premium fuel
>> makes little difference because the engine adapts to the fuel.
>> 
>> Old engines were tuned to specific values/fuels, so using what
>> manufacturer recommended was more important.
>
> But if the manufacturer recommends high octane, then yes, the car 
> will run knock-free on lower octane. It does this by detuning the 
> engine so it produces less power and lower fuel efficiency. Why buy 
> a car with a high compression engine if you're going to detune it?

To save a whopping ~$24 in gas per year, I suppose...

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JR