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Originally Posted by rogue
The best mileage I've ever seen is 21.4mpg at 70mph with cruise control the entire time. On a road trip to Arizona last week from Los Angeles, I got 19.2 with the AC on full at about 90mph most of the time.
You're on par with the rest of us 
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It astounds me that my 40-year-old Chrysler with a big block V8 and four barrel carb gets better mileage on the highway than a new 300C with MDS. Just amazing. It gets 22-23 mpg at 70 mph, no cruise control, no AC (windows down or windows and top down).
I have no idea how that is possible. My car even weighs a lot more.