I don’t haul things for hire. I’m hauling our own equipment to job sites. It is all an expense but yeah spending about 65 cents per mile on fuel.
Ideal cruising RPM for MP8?
Discussion in 'Experienced Truckers' Advice' started by Bdog, Feb 4, 2021.
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so then there’s your answer: payroll matters more than fuel mileage.
You got a truck thats not specced for running highway speeds where you are, and it’s not worth slowing down because of the extra payroll for the time it would take.
Re working the truck you have would never pay for itself in fuel savings based on the limited miles you run every year.
so the answer is: next truck you buy, buy one specced for the work you’re gonna do.JoeyJunk, Brettj3876, wore out and 1 other person Thank this. -
How are you so sure it will never pay off?
Let’s just use 1000 miles a month, $3 diesel, and 4 mpg. That is $750 in fuel. Now if I were to get six mpg it would only take $500 in fuel. $250 a month savings is $3,000 a year. Not sure what it costs to regear but say it was 6k I would break even in two years. Sometimes I drive more. For example I did 2,000 miles in the last ten days. If I was getting 6 mpg I would have saved $500 in fuel on that one trip.
My truck only has 140k miles on it. I plan on running it until I retire.alds Thanks this. -
I honestly don't think its very realistic to see a 33% gain in fuel economy by a 250 to 300 rpm drop. Aerodynamics and wind drag are likely your limiting factor at that speed.
Atlanta trucker, Brettj3876 and Ruthless Thank this. -
Have a 450hp Cummins with 13 speed and 3.36 gears doesn't pull hard enough for me.
Also have seen 445hp with 13speed and 3.55 gears in a CXU. I believe these trucks should pull plenty hard, but they have a few more miles on them. Hard to find manual transmission in Mack road trucks. -
Maybe if you had a rear end go bad then would be the time to do a re gear.
Like others have mentioned it would take awhile to save enough fuel to cover a re gear.
With that being said you may could find someone wanting to swap gears with you. Just do a trade and only be out the labor and fluids. -
As far as 3.08s go, most Mack-Volvo people would tell you that’s not an ideal ratio for these powertrains. I think it pulls well, but fuel economy would be better with say 2.64 rearend. I think it’s better if you’re doing mountain pulling regularlyloudtom and Mattmanstroked Thank this. -
Going back to the OP......if he needs to run 80 mph forget about fuel mileage! It just isn't going to happen at that speed!
JDBrettj3876 Thanks this. -
If i run 72-73 it drops right down to 6.1-6.3Atlanta trucker Thanks this. -
If you do swap, just hold on to the old set in case you want or need to go back.
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