Abstract: The invention relates to systems and methods for modifying the volatility of petroleum prior to ethanol addition. The methods can include (a) providing (i) a supply of gasoline, (ii) an ethanol standard, and (iii) a supply of butane; (b) analyzing the volatility of a sample formed by mixing the gasoline and ethanol standard; (c) calculating from the volatility a ratio of butane that can be blended into the sample without causing the sample to pass the one or more fixed volatility limits; and (d) blending butane from the butane supply with gasoline from the gasoline supply at or below the ratio calculated in step (c).

Abstract: A portable material transfer unit allows for the loading and unloading of a material from a storage medium. The portable material transfer unit is a self-contained unit that can be moved to any location accessible by motorized vehicle without the need for pneumatic or electrical hook-ups. Thus, the portable material transfer unit can be used to load or unload material from railroad tank cars in temporary locations not generally considered to be loading or unloading stations. Also, the portable material transfer unit can transfer material from railroad tank cars without the need for repositioning of the cars by a locomotive. Furthermore, the portable material transfer unit can quickly and easily be converted from an unloading position to a transporting position so that the portable material transfer unit can be towed on any highway or public access road.