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I changed to a higher ratio transfer box in my 4BD1T powered truck, dropping the rpm at 100km/h from 2500 to 2000.
Fuel economy picked up by over 10% (to be expected if you see the fuel consumption curves), noise dropped off dramatically and I could also then use 4th gear for passing (2800rpm at 100km/h, not far off max power).
With 118mm stroke these engines don't like screaming.
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