You can always try Ethanol gas instead of regular. I have tried it for a
month before on my Bonneville SSEi while keeping track on gas cost. During
summer month, you may hear engine knocking. Especially while you are
driving in between a walls or tunnel. Personally, I would not do it again
because you are taking away the joy of power, acceleration and not to
mention a potential engine damage. The difference in gas cost is
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