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Re: 450/6.4 owner help please!!
I think the problem you have is that you are driving 70. Even my fuel miserly 3.73 7.3L's millage would start to got the c**p above 55. You want a big truck either slow down or eat the fuel.
No matter which of my trucks I have driven there is a sweet spot rpm wise where they just purr along and sip the fuel. Find that and stay there.
Rob
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08 6.4 F350 SC LB DRW
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