I have a 2009 prostar with a cummins 565 and a 13 speed i belive i have 355 rears i run 70 at 1575 rpm on 22.5 rubber would i get better fuel milage if i change my ratio to a lower ratio like 274s would it be worth the change i am getting 6.5 now
355 rears?
Discussion in 'Ask An Owner Operator' started by earnies2, Jan 22, 2018.
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Tried slowing down to 65mph?
Calculate and track your average miles per day - if you have to run at 70 mph all day and can’t return a good profit then re-examine the business model.spyder7723, fargonaz, Blu_Ogre and 7 others Thank this. -
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I usually run 65/68 i went to 70 just to see what the rpm wasblairandgretchen Thanks this. -
i would look up what the manufactures recommended cruse rpm is for that generation of that engine. and go from there. im not sure where a 09 isx would want to be but its been a while sense the last isx i drove but i seem to remember it wanting to be in that 14-1500 range. -
If your running East & West those tall 2.somethings are very good and he will get 8 all day and still be able to go faster.
He has a 13 so the hills won't bother him much. Yes he will climb the big hills slower, but overall he'll go way up.Cw5110 Thanks this. -
Good cheap way to test a gearing change is to go from LP22.5's to 11R22.5's the next time you buy tires...be like putting in 3.36 gears but doesn't cost any more than the tires you were needing to buy anyway. And if you don't like it, swap back when you need tires again.
BoxCarKidd, win-some-loose-less, Pup97 and 2 others Thank this. -
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jamespmack Thanks this.
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Changing from lopro to tall is like changing rear ends. The smaller the tire the slower it will run at a given Rpm than a tall tire
jamespmack Thanks this.
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