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Message: [QUOTE="Morgan@Midwest Diesel & Auto, post: 540217, member: 8143"] Most 6.4's I've ever owned and others that I've been around do not get good mileage. I've had four 6.4 trucks and I've never had one that got much more than 16-17mpg on all interstate with 13-15mpg normal driving. And towing I've averaged as low as 8mpg. Btw these were all deleted tuned trucks. Probably has more to do with how you drive and how fast you normally cruise. But I know lots of people who complain about 6.4 mileage, tuned and stock. The best mileage truck I've ever owned was a 6.0. Sent while hooked to something, somewhere, with my foot through the floor! [/QUOTE]

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