I think that given Honda's tight specs in engine mapping, what we are seeing is more to do with fuel quality. I do think there are some differences, obviously in the blends, but we all need to consider that there is most likely vast differences between storage at stations. I believe moisture content is probably causing some variance. I usually fill up at HIGH volume stations in my hometown. I have in the past gotten what I think is bad gasoline. In those cases I did notice a difference in the way my vehicles ran. Good discussion! Anyone have any other bad fuel stories?