Right now my MPGs average low 4s. If I regeared and got it down to say 1300 at highway speed would it make a significant difference?
Ideal cruising RPM for MP8?
Discussion in 'Experienced Truckers' Advice' started by Bdog, Feb 4, 2021.
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Do the make tires taller than what I have now? I don’t know. That would effectively change the ratio. The low hole gear I have honestly never used. Never needed it.
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Fuel economy will definitely increase and the engine will last much longer.
You most likely need to be in the 3.08 range. I would bet a steak dinner you pick up about 1.5 mpg or better with 3.08s ... the Mack motors hate rpm and get very thirsty up thereloudtom, Trucker61016 and Moosetek13 Thank this. -
Atlanta trucker, lester, singlescrewshaker and 5 others Thank this.
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With 3.23 rears you could run 78MPH at 1450 RPM.
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The sweet spot in torque is a balance between the final gear ratio and the camshaft.
KB3MMX Thanks this. -
You need to change the ratio to 3.08, with the 18, you can use the lower gears without any issues at 65k
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I've driven all these newer motors except the paccar and below 1300 they all fall flat on their face
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