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Actually the new 2011 diesel in the Ford is a 6.7 and not a 6.8.
We are running two 09 F350s with 6.4s and had to make changes because of fuel mileage and poor performance. We work our trucks harder than anyone pulling a RV (farm; tandem dually 30 foot goose necks, etc.). After the changes some 12 months ago, we are getting superior results from the 6.4; it is one tough engine; had to replace one rad otherwise no problems whatsoever.
This discussion could go on for ever; as each of us have priorities in what type of service we want from a super duty truck and it is still nice to have a choice from the big three!
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