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Custom Trailer Sales
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The 7.3 is proven reliable. The 6.4 makes more power mod for mod. I'm not sure what kinda fuel mileage the 6.4 has been getting, but the 7.3 is usually between 16-20.
 

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It would be nicer to have a newer truck. The 6.4s get good mileage once you delete the DPF. The 7.3s are tried and true, but are really outdated and dollar for dollar you are better with a 6.4 as far as performance parts go.
 

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Discussion Starter #6
the price isn't a huge thing but can't go higher then they are asking for the 6.4. I also didn't know if they mad any changes in the 6.4 in the years they made it.
 

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i went back forth between the two when i was shoppin for truck the past month or so. i ended up goin with a 7.3...easier to work on.
 
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