My dealer, I would imagine, used regular for its first tank as well. Think about a lot of dealers... It's all about the almighty dollar. Anyway, I noticed that my first tank of gas, running well within the break-in procedure, I only returned about 19.5-20.5 MPGs. I put in my Shell V-Power (and then made the "V" sign with my fingers to all the people who passed me. he he. JK. Their ad) my MPG's jumped to between 23.5-26.5. Initial few miles? Maybe, but I think it could've been the gas.
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