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    By simply mixing equal amounts of two different octane grades of gasoline (petrol) in one's tank (say 89 and 93), can one create a grade of fuel with the average of the two octanes (say 91)?

    Question #81213. Asked by mike32768. (May 30 07 11:26 AM)


    MonkeyOnALeash

    		Precisely! That is how the pumps do it. SUNOCO is the company who started the mixing with a minimum of 4 grades.

    It is a simple mix-ratio.

    "An octane sensitive blending dispenser for fluids, particularly for fuel dispensers. The dispenser controls component pumps according to octane data measured by octane meters. In one form of the invention octane measurements are taken within the input lines connected to the dispenser from fluid storage tanks. Control of the component pumps is accomplished by determining the difference between the desired blend octane and the observed blend octane and adjusting the pumps so as to more closely blend the desired fluid."

    http://www.freepatentsonline.com/5956254.html

    May 30 07, 12:23 PM
    Baloo55th

    		We used to have blender pumps in the UK. 91 at one end of the scale, and 99 at the other. You could get 93, 95 and 97 as well as the straight 91 and 99. They were scrapped years ago when unleaded came in.

    May 30 07, 12:42 PM

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