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The specific gravity of gasoline is .739 and the specific gravity of ethanol is .787, while there is a difference in density of the two liquids, they are not likely to separate unless the car sits for an extended period of time like an entire winter. Movement will keep the two liquids mixed.
The gauge can move at a different rate according to the shape of the fuel tank...due to rounded edges at the top and bottom of the tank or if the tank has an odd shape.
My 986 fuel gauge will go slowly until I get to a quarter tank and then the gauge will drop very quickly to nothing. I fill up at a quarter now and don't like it to drop below a half a tank if I can help it.
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2001 Boxster S 3.6L, Zeintop
"Calling upon my years of experience, I froze at the controls." - Stirling Moss
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