There are so many gas brands in market these days (Shell, Citgo, Sunoco, BP, Hess, Mobil, Chevron, ...) and recently a friend suggested using Mobil over Sunoco not only pushes his MPG high but he can also feel the smoothness in his driving.
Is it true that one brand is better than the other? And if so, which brands in market are better than the others?
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