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Really? Most cars factory tuned for 87 don't benefit from premium. Although considering it is e85 capable which is a very high octane, I could see how the computer would possibly be able to adapt to the slight increase in octane from premium. I always wanted to play with E85 in the Cobalt SS but it's not available close enough to me. (Ironic, considering there are plenty of corn fields out here in BFE)
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