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From: dswankii@uok.UUCP
Newsgroups: net.auto
Subject: Re: gasoline and gas mileage - (nf)
Message-ID: <3749@uiucdcs.UUCP>
Date: Wed, 9-Nov-83 22:10:32 EST
Article-I.D.: uiucdcs.3749
Posted: Wed Nov  9 22:10:32 1983
Date-Received: Fri, 11-Nov-83 22:32:35 EST
Lines: 19

#R:hou5h:-30100:uok:500004:000:799
uok!dswankii    Nov  7 16:35:00 1983

Some types of gas could have different btu ratings due to water in the
gas or use of alcohol as an octane booster. Less btu means less heat
and because your engine is a heat machine that means less miles per gallon.

As far as water injection goes, water injection by itself will not give
you better milage. Water injection controles pinging by cooling the 
combustion gasses and slowing the rate of burn. By itself this will result
in less economy (see above). What gives better milage is that you can set
the tune of the engine for better economy (advance the spark,etc) and water
injection will control knock. If the system provides the right amount of 
water, no adverse problems will result. 

I have not noticed any increase in exhaust rust.

				David Swank II
				ctvax!uokvax!uok!dswankii