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After 20 tanks I found a difference
A few years back I was commuting a crazy distance that burned a tank of gas every other day. At the time Speedway brand was offering a $.05 per gallon discount if you had their loyality card so I frequented them. When the promo was over I got curious and decided to compare them to BP across the road. I ran each brand in alternate tanks to help offset environmental influences as much as possible. After 10 tanks of each I found that BP had averaged just under 1MPG better. But that was in a Chevy Silverado getting about 18MPG, YMMV.
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