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I got the same from Macon, Ga to Jacksonville, Fl., lightly loaded and a tail wind. I set the cruise on 70 the entire distance. I used 93 octane.I just took a 1000 miles road trip and I got around 23 mpg average. New plugs, new air filter, new oil change and I drove around 70-75 mph. I got around 520 miles on a full tank when I filled up.