O.K. to start out I have an 07 379 legacy with a 565 isx cummins, 18 speed tranny, and 3.58 rearends!!! my question is and this might seem long is!! Right now my truck has 24.5 l.p. 285x75 rubber on it and I'm needing new rubber soon b4 my casings r now good, but I'm debating on going up 2 just the 24.5 tall rubber! Will this give me a better m.p.g. or wi it kinda even out due 2 more rolling resistance, and so on or will this help me out with getting better milleage in this day and age???
I'm not on of those heavy on the feeder kinda guys, and am big on keeping my r.p.m.'s under 1500 when i shift, I'm a progressive shifter, and still try 2 keep my revs under 1500 as much as possible cause i find that's where i get the better economy. I squeeze as much outta my fuel as I can!!!!!!! and if it makes a di I'm buying toyo 627's if that make any difference!! Thx for you time and I do look forward 2 your opinions!! Jared Canadian long hauler!!!!
?? about tires size for fuel mileage!!
Discussion in 'Ask An Owner Operator' started by Hammerman379, Jul 30, 2008.
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I dont think you will see that big of a difference, yes you will add rolling resistance, so you mpg might drop, but like i said i dont think it will be to drastic to notice, 1-2 tenths perhaps.
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eskimo posted some hard number on this from his operation awhile back but I forget where he posted it. You have more rolling resistance and more weight. I believe he said the found a 1/2mpg difference between the tall and low rubber. the biggest avings was to go to low pro 22.5's but not everyone wants the cost involved with that and you are not geared for it. Personally I'd stay with the lp 24.5's. my truck has tall rubber and i'm contemplating going to the l.p.
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I think eskimo posted going from 11R24.5's to lo pro 22.5s, then yes there is a big difference, but between 24.5s i dont think he will see much of a difference. 1-2 tenths.
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he posted both. just can't remember where it was
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Comparing new virgin drives to something else, with the differences in sizes factored in, makes it hard to judge fairly. When checking tires, a tire with lots of tread will have more rolling resistance than a well worn tire, except where conditions are bad, the worn tire will work better overall, when its wet or muddy, is when you need lots of tread. 22.5 lp tires are the best available, unless you go to the wide base singles, 24.5 lp would take slightly more fuel, and weigh a bit more, the 11R tires will take more load but have more rolling resistance. Open lugs perform more poorly in mileage and tire life, but if you need them you have to have them. The 24.5 will ride better and the tall rubber tends to ride the best
Heavy spec trucks have tall rubber to carry the extra weight. -
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it's a wash. they do get better mileage but they wear out faster so money wise it's a wash. some people like them some don't. it is a bit worrying about trying to find them out in the middle of nowhere though
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