The best way to figure out YOUR best mpg's it to hook up and do a trip. I just did a 6,000 mile trip to Iowa from Ca. and got 10.7 mpg's. I did some sight seeing which helped my mpg's but thats what you are looking for. I have a 15 6.7 and couldn't be happier with my fuel millage. Just can't understand why diesel is so expensive. Even more than premium gas by about $.50 more. I guess the country doesn't want us to see it anymore. Diesel here is $3.81
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