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How much ethanol in US gasoline?

How much ethanol in US gasoline?

How much ethanol in US gasoline?

(OP)
Recall that EtOH replaced MTBE as a gasoline oxygenate in ozone non-attainment areas several years before the mandate to replace 10% of the petroleum component nationwide with ethanol.  I have been given to understand that oxygenate requirement is IN ADDITION to the E10 base, so many metropolitan areas may be running closer to 15% ethanol.  Can anyone knowledgeable confirm or comment?
 

RE: How much ethanol in US gasoline?

Most of the pumps around here are labeled "May contain up to 10% ethanol".

RE: How much ethanol in US gasoline?

In Tennessee many gas stations have signs that say "No ethanol in our gas".  

RE: How much ethanol in US gasoline?

(OP)
Thanks, but my question relates specifically to areas requiring oxygenated fuel.  For example, apparently Tennessee does not require oxygenated fuel (http://www.mobil.com/USA-English/GFM/Files/US_Gasoline_Map.pdf).  Now that I review the map it appears east TX is still using MTBE, whereas I thought it had been phased out nationwide.  So perhaps I should expand my question to include the status of fuel oxygenates as well as the relationship to EtOH content?

RE: How much ethanol in US gasoline?

Summer formulation gas requires 2% oxygen by weight in the fuel (e.g. California), which is 5.6% by volume ethanol.

Among other sources: http://en.wikipedia.org/wiki/Gasoline

Because ethanol is volatile and can contribute to smog, I am dubious that it would be an additional requirement above any base ethanol amount. A 10% ethanol fuel would already conform to CA summer formulations. However, I couldn't readily verify that anywhere.

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