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If your 6.0 is running fine and has been trouble free stick with it. The 6.4 is a much more refined set-up and runs so much more smooth but is amazingly complex plus due to the emissions systems you will see about 2mpg less unless you really drive like a grandpa.... If you do then you can get mileage close to the 6.0... If you have money to burn then get the 6.4 it really is a extremely nice truck. Except for a couple part issues the 6.4 has been relatively problem free. If you go with a let over 08 you can get some serious money off. Most are walking away with a 50k truck for very upper 30s after all rebates....
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2005 Excursion w/ 6.0L PSD
2008 FX4 F250 CCSB w/ 6.4L PSD
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