Originally Posted by lazyWJ
This is interesting. It doesn't sound like something an operator has any control over, but might be helpful in recognizing the possible differences. Could you elaborate?
Some refiners or traders they add certain blends to achieve the target octane number, for example some traders they could get a good deal buying low octane gasoline, so they buy it and upgrade it in their plants by adding another blending component, for example some of them they use low molecular weight blends which can boost the octane number, but at the same time will boost the RVP (ratio vapor pressure) where there is a maximum limit for the RVP, the RVP in brief will give an indication for the volatility of that component. So if you use that gasoline with such components you might be having lower MPG than other gasoline blend.
Talking about refiners, some of them they are facing problem with one of the units that produces the high octane component and it is down, so they tend to use other available blend which not healthy to be used and not very feasible and it will put their gasoline on the higher side of the gasoline specs range, but they have no choice but using it to fulfill the local demand.
Mainly there are several specs for the gasoline where they have to stick with it such as the octane number, RVP, Oxygenates, and many others.
And by the way there are other blends contains component tends to form gum and fouling material in the tank causing plugging in the fuel system.
This is in brief but if anybody interested to go deeper in details with some boring chemical details I will be happy to help
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