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From: goldman@ittvax.ATC.ITT.UUCP (Ken Goldman)
Newsgroups: net.auto
Subject: Re: mileage and performance with hi-octane gasoline
Message-ID: <479@ittvax.ATC.ITT.UUCP>
Date: Tue, 17-Sep-85 12:43:49 EDT
Article-I.D.: ittvax.479
Posted: Tue Sep 17 12:43:49 1985
Date-Received: Thu, 19-Sep-85 05:20:47 EDT
References: <610@osu-eddie.UUCP>
Organization: ITT-ATC, Shelton Ct.
Lines: 14

> High-octane gasoline contains more energy per gallon than low-octane gas,
> right?  
> should drive my car further (more mpg) than would low-octane
> gas, right?  How much further?  Enough further to offset the price
As I remember it, high octane gas only burns more slowly and is less likely
to detonate from high temperature and pressure.  It contains no extra energy,
dispite the gas company ads.

It's useful in high compression engines where the lower octane would ignite
from the increase in pressure instead of waiting for the spark -> knocking.
Also at times in modern engines which run hotter to decrease pollution.

While high compression engines have better performance, it's the engine.
Using higher octane gas gains you nothing.


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