Actually, when you count summer versus winter and the high/medium/low octane combinations it is nearly 100 blends.
Most of the blue states have blending requirements for their gasolines. There are something like 40 different blends sold in this country and they are made at specific refineries. So, a refinery in Benecia CA cannot make the blend that is required in Chicago or San Antonio.
Refineries are all at least 30 years old and are operating way above their designed capacities. Running the ragged edge. Add to the mix, the obama regime shut down all new drilling in the Gulf of Mexico and we have a very precarious situation.
The fix to all this is very simple, but it would require the govt to get out of the oil business.
Actually, when you count summer versus winter and the high/medium/low octane combinations it is nearly 100 blends.
I know.