Date: Sat, 13 Mar 1999 00:19:03 -0500
From: Patrick Valleau <>
Subject: Re: Premium vs. Regular Gas

In the US the volitility of the fuel is regulated by the EPA. It is measured as "Reid Vapor Pressure" and has been lowered each year since about 1985 as part of the general tightening of emissions. Less vapor emissions, less smog. Because of this, higher octane fuel, which is less volitile then lower octane fuel anyway, can cause drivability problems. sometimes severe. Especially in cold weather. That car will run fine on 87 octane(US). On a trip, or towing, or in hot weather, a higher octane will be fine.(Unless your trip is to Vermont to go skiing!) Pat

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