What size tires for better MPG @ 70-75 MPH? - Dodge Cummins Diesel Forum
1st Gen Tire and Wheel Discussion of tire and wheel options

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post #1 of 16 (permalink) Old 12-26-2016, 02:52 PM Thread Starter
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What size tires for better MPG @ 70-75 MPH?

I have a '90 non-I/C stock (as best as I know) G360 5-Sp and 4.10 gears.
I need tires and am wondering if I should go for 265/75-16 or taller but wider 285/75?
I wonder if lowering then engine's RPMs with the 285/75s will be offset by their rolling resistance?

I will be getting a somewhat agressive tire as I sometimes find myself on slick muddy roads.
I am also going to be getting cheap tires (low budged and old truck), so something like a Kenda Klever MT or Ironman All Country.

So, back to the question...... 285 or 265?

I know I would do better with a 255/85, but they are hard to find and out of my price range.

I'm hoping to get a set of 4 for about $600.

What are your suggestions? Thanks.

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post #2 of 16 (permalink) Old 12-26-2016, 03:04 PM
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You get better MPG's with a narrower tire.

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post #3 of 16 (permalink) Old 12-26-2016, 04:03 PM
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Hard to get good mpg with a 4.10 truck. Unfortunately, mine didn't change from 235/85 to 255/85 or anything else I did to it for that matter. I would at least go with the 285/75

2012 Laramie Longhorn, EFI by Ryan, 5" FloPro, 35x12.5x20 Toyo AT II
1995 Dually, Weston's 5x.016, 4k GSK, 5" FloPro, 255/85r16 Toyo M/T, Goerend, ARP, 60# Springs, BW 62/65/14, BW 75/96/1.10, Isspro, Fass 125, BDP Sump, 7mm DV's, Old Numbers 421/946
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post #4 of 16 (permalink) Old 12-26-2016, 04:40 PM
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I'd go with the 285/75R16, at the speeds were capable of with 4.10s I don't thunk running a narrower smaller tire is going to be worth it vs getting further per revolution.

If you tow make sure the tires are Load range D or E.

92 extended cab long bed D250, Getrag 5 Speed, 4" Straight Piped, 366 Spring, DAP 5x12s, AC, Air bags, 3.54 ratio, 220k miles.
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post #5 of 16 (permalink) Old 12-26-2016, 05:24 PM Thread Starter
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1320Fastback, I tend to go for load range E due to stronger sidewalls (thorns etc.). I won't be towing anything heavier than a trailer with 2 ATVs.

9297Oldram, I know skinnier is usually more fuel effecient, but I didn't know which trumped which (lower engine RPM from taller tires, or lower rolling resistance from skinnier tires)

Is there another COMMON tall skinny tire (taller than 235/85) that I'm not thinking of that fits a 16" rim?

If there really isn't anything else out there, then 285/75 will probably be the choice, and I'll just live with a higher RPM on the highway (I guess I could slow down.......nahhh)
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post #6 of 16 (permalink) Old 12-26-2016, 05:32 PM
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I have these they really bite in the mud and snow. https://www.onlinetires.com/products...horn++bsw.html

97 2500 4X4 auto, 8 fuel plate, BD converter

96 F250 SC zf5, 4x4, SAS, 92 Cummins, Bosch 190's, THD fuel pin, THD HVLP with adjustable fuel pressure mod, WM, wh1c hybrid 60/64/18.5
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post #7 of 16 (permalink) Old 12-26-2016, 05:39 PM Thread Starter
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9297oldram, Thanks.
They look good, but out of my price range. With shipping, they are about $750. I still have to pay 16 per tire for mounting and balancing locally I appreciate your input. Being on the poorer side of the spectrum sucks.

I may have to go for something cheap like these:

4 Kenda Klever M/T KR29 Mud Tires 285/75R16 285/75-16 75R R16 2857516 | eBay
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post #8 of 16 (permalink) Old 12-26-2016, 05:52 PM
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Quote:
Originally Posted by zoomer View Post
9297oldram, Thanks.
They look good, but out of my price range. With shipping, they are about $750. I still have to pay 16 per tire for mounting and balancing locally I appreciate your input. Being on the poorer side of the spectrum sucks.

I may have to go for something cheap like these:

4 Kenda Klever M/T KR29 Mud Tires 285/75R16 285/75-16 75R R16 2857516 | eBay
I dismount and mount my own tires and usually don't worry about balancing unless they are really bad. Big tires like that are easy to put on the rims, and I used to take them to Walmart and they would dismount for $5.00 each.

97 2500 4X4 auto, 8 fuel plate, BD converter

96 F250 SC zf5, 4x4, SAS, 92 Cummins, Bosch 190's, THD fuel pin, THD HVLP with adjustable fuel pressure mod, WM, wh1c hybrid 60/64/18.5
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post #9 of 16 (permalink) Old 12-29-2016, 09:07 AM
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Quote:
Originally Posted by zoomer View Post
9297oldram, Thanks.
They look good, but out of my price range. With shipping, they are about $750. I still have to pay 16 per tire for mounting and balancing locally I appreciate your input. Being on the poorer side of the spectrum sucks.

I may have to go for something cheap like these:

4 Kenda Klever M/T KR29 Mud Tires 285/75R16 285/75-16 75R R16 2857516 | eBay
Have you checked out Tire Rack? they have some really good prices.

My build thread over here.

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post #10 of 16 (permalink) Old 12-29-2016, 09:46 AM
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I just bought these from Tire Rack: LT265/75R-16 SUMITOMO ENCOUNTER HT E - around $115 each. Not particularly aggressive tread.

I can confirm these fit on a '93 4x4 with no rubbing whatsoever.
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post #11 of 16 (permalink) Old 12-29-2016, 10:48 AM Thread Starter
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I currently have 265/75-16 and want to go taller.
Thanks for the Tirerack suggestion.... I'll check them out.


I really need a more agressive tire than that for the dirt/mud roads I travel.
I also live 80 miles from the nearest place that Tirerack works with...
They want $40.53 shipping PER TIRE!!! To ship them to me. That makes the cheapest tire they carry
a total of $750.12 for a set of 4 (plus local mounting even if I do it myself).



Thanks for your input everyone. I wish I could have gone for a taller skinny tire as was suggested, but they just cost too much. I appreciate your advise, but my wallet made the final decision. Wish me luck with the Kenda's, they cost $585 including shipping to my front door.

I'll see if I can take 9297oldram's suggestion and try mounting them myself to save some cash.

Thanks again for your suggestions everyone.
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post #12 of 16 (permalink) Old 12-31-2016, 11:09 PM
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Quote:
Originally Posted by 9297oldram View Post
I have these they really bite in the mud and snow. https://www.onlinetires.com/products...horn++bsw.html
How many miles have you put on these? Had these on a jeep before and I burned through them way too quick I've heard they are soft rubber.

1993 w250 club cab ,flatbed, bd pin and gov spring, turned up pump, 4" diamond eye and THD 6x11s
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