Originally Posted by blackxfire
Keep in mind that Shell is formulated differently than the other brands. Here in MA, Shell is the only high quality gasoline on the list of brands that will not leave sot and crud on your exhaust pipes. I saw the list somewhere, probably on the forum. I think it's worth paying a little extra. For only $2 to $3 per tank full.
all the gas companies use gas piplines to transport gas to main hiub locations around the country. all the gas stations use the same pipeline, so your shell gas goes through the same pipeline as the bp, exxon, etc.. they don't clean the pipes between each use all the gas is the same