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The 5.9 "Heavy Duty" was simply a 5.9 V8 without as much in the way of emissions controls. The HD rating was just an emissions thing, not a performance thing.
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Originally Posted by sheepdog44
Transmission type Efficiency
Manual neutral engine off.100% @∞MPG <----- Fun Fact.
Manual 1:1 gear ratio .......98%
CVT belt ............................88%
Automatic .........................86%
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