Most gasoline, heating oil, diesel, jet fuel etc is all shipped in the same pipeline separated by nothing. Depending on when the particular gasoline shipment reaches its destination/delivery point, it could have a slight mix of whatever was shipped just before or just after it in the pipe. The only difference between brands is maybe a 16 oz can of detergent added to about 8,000 gallons of fuel in the tank truck delivering it to the local gas station. Stick with the top tier to be sure but its all the same stuff..