Ideal cruising RPM for MP8?
Discussion in 'Experienced Truckers' Advice' started by Bdog, Feb 4, 2021.
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JDBrettj3876 Thanks this. -
JoeyJunk and God prefers Diesels Thank this.
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I drove a Mack with the MP8 505/1860 with iShift 12spd. 3.25 rears it was turning 1750rpm roughly 82-83mph. It came with lo pro 22.5s but had 11r22.5s at the time and the speedometer wasn’t recalibrated. I could get low 5’s MPG running 75ish. Obviously iShift a bit different gearing but for the “suggested” RPM on those motors it was a bit high. It ran and pulled like a scalded dog though lol
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For what it’s worth the Volvo I have now (D13 same engine) has 3.08s with the ishift, set at 455/1850 and I only get high 5’s/low 6’s with it. We usually run heavy and I idle every night though.
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I would be happy with high fives low sixes. Just completed a 2,000 mile trip, 65k gross, less than 30 minutes idling, averaged 4.4.
racemaxx24 Thanks this. -
Your driving way to fast.
Spend a week never going above 65 and I bet your mileage hits 6 mpg. -
What is your cost per mile for fuel ?
You have got to be what .50 - .60 cents per mile on your fuel cost ? -
Your also running tall tires so that will lower your fuel mileage.
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Brettj3876 Thanks this.
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