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My suburban does 18mpg average with the cruise on 70-72mph. It will do 25mpg at 45-50mph. Are you guys going by the DIC or hand calculating. I found that the DIC in my burb is heavy optimist. I have gotten as good as 22mpg in mixed use but it was impossible to maintain that. The DIC was reporting 24mpg+ of course. I wish it had the cylinder deactivation. I feel the system is good for 20% improvement around town, more in skilled hands.
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