The fuel is tested with a meter that measures it's resistance. The reason you can't mix two different but legal fuels is that they will test out of the acceptable range for both of the fuels mixed together. Each fuel that is accepted is tested and it has a resistance range that it has to fall into when tested. The fuel check guy has book with all the numbers in it, and he can tell by the color of the fuel what it is. If two fuels are mixed so will it's color, thats when the reg flags go up.
When I started class racing I couldn't understand why I couldn't mix two legal fuels together, there both legal why not. Then someone explained how they do it and what they are looking for. If you have 10 gals. of VP mixed with 1 gal.of Sunoco most likely the fuel will fall into the VP range. If you go 7 & 3 it may not. If it's 5 & 5 it will fail.
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GEORGE MIRZA STK 1236
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