Patent ID: 8518131

Claim:
A method of blending a first volatility modifying agent (FVMA) into a petroleum supply that also is mixed with a fixed ratio of ethanol, in an amount that does not cause the petroleum/ethanol mix to exceed one or more fixed volatility limits, wherein the petroleum supply varies over time in terms of content and volatility potential, comprising: a. providing (i) a supply of petroleum, (ii) an ethanol standard, and (iii) a supply of FVMA; b. analyzing the volatility of a sample formed by mixing the petroleum and ethanol standard; c. calculating from the volatility a ratio of FVMA that can be blended into the sample without causing the sample to pass the one or more fixed volatility limits; and d. blending FVMA from the FVMA supply with petroleum from the petroleum supply at or below the ratio calculated in step (c).