Frequent Questions

For areas not required to use RFG, do states have the ability to set ASTM performance specifications and any volatility allowances from those specifications for ethanol blended fuels?

Areas not required to use RFG are subject to the conventional gasoline and federal volatility regulations. States may not set ASTM performance specifications for characteristics or components that are controlled or prohibited by these federal regulations, subject to approval as a SIP revision. For example, state RVP limits in both conventional and RFG areas are preempted unless they are approved as a SIP revision.(7/1/94)

This question and answer is posted at The original was posted in the Q&A posted on 7/1/94 which can found at" See Question ID 3857 for RFG (Taken from the first question on
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