A Look at Ethanol Testing Results -- for Non-Ethanol Race Gas
 
 
For comparison purposes, I ran the ethanol content test against a sample of non-ethanol race gas.  This shows what the results that one would expect, when testing a gas sample that does not contain ethanol.  The control sample for this test is a batch of VP Racing, non-ethanol race gas.  It has an identifying pink marker tint, put into it by the manufacturer.  The below picture shows a sample of the gas in the squirt bottle.  The testing tube shows the non-ethanol VP Racing gas sample loaded in the testing tube with water.
 
Running through the test procedure I measured the controlled amount of water used to phase separate ethanol from a fuel containing it.  I then added the prescribed amount of gasoline into the marked test tube.  In the below picture one can see the pink VP Racing race gas sitting on top of the clear water.

 

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Non-ethanol Race Gas Sample
 

Next I added a drop of the blue ethanol marking dye to the water and gas in the tube.  I shook the tube to mix the water, gas, and dye, and then let it sit for a few minutes to settle back down.  The below picture shows the pink VP Racing gas sitting on top of the blue tinted water.

If ethanol were contained in the gasoline then the ethanol would phase separate and mix with the water in the bottom of the tube.  The volume of the water with added ethanol would have increased from the starting measure, and the volume of the pink VP Racing gas floating on top would decrease.

In this case the below picture shows that the volume of dye marked water is the same as I had measured into the tube (the drop of dye does not significantly increase the volume of the water), as no additional alcohol has separated from the gasoline.  Which of course is what one would expect, since this VP Racing gas sample did not contain ethanol.
 

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Race Gas with Dye
 

The following picture shows a closer look at the fluid measurement in the test tube - showing that no ethanol was separated out of the gas.  The water level remains as originally measured, at the "0" line of the tube.

Had there been ethanol in the gas, the level of water and ethanol would have risen above zero.  And, because of the proportions of water and gasoline added to the test tube, the readings would have indicated the percentage of ethanol that had originally been in the gasoline, and which was removed by phase separation.
 

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Zero Ethanol Level
 


Just to emphasize the point that there is no ethanol in this gasoline, I added two drops of marker dye to the non-ethanol race gasoline sample itself  and shook the bottle thoroughly.  This marking dye has nothing to bond with in dry non-ethanol race gas, so it fell back out of suspension into a single drop in the bottom of the bottle (the dark spot, right of center, at the front-bottom edge of the bottle) .
 

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Dye Does Not Mix
 
Had this been E10 gas with ethanol, the dye would have gone into even suspension in the gasoline and tinted the whole gas sample blue.
 

 
Conclusion
 
This was a control test of a non-ethanol gas sample, so, no surprises here.  Since there was not any ethanol to separate out of this non-ethanol VP Racing gas sample, the water and gas volumes remained exactly as originally measured into the test tube.  The marker dye colored only the water in the test tube, added to cause phase separation.  And the marker dye fell out of suspension in the gas in the sample bottle, and sits in the bottom of the tube.

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