JMO but based on a trip I took in August to visit Yellowstone, Glacier and Canada's Jasper National Park, I'm not convinced that it really matters what brand of gasoline one uses as long as it's uncontaminated and meets the octane requirements set forth by the auto manufacturer. Here's a quick summary upon which I based this conclusion. BTW, I was surprised at how good the MPG turned out since I tried to avoid the freeways (much more fun/interesting driving on secondary roads IMO) and the trip involved traversing the US and Canadian Rockies several times. Anyway, JMO.
