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Old 08-30-2011, 07:08 PM
xploded xploded is offline
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Default Bigger Tires and better/same gas mileage? Nitto Dura Grappler


I have an 09 ram 1500 2wd with the stock 275/60R20 tires. They are worn, and I plan to increase the tire size to a 305/55R20. The tire will still be 33" tall like the stocker, but is now 12.5 wide instead of 10.8. Naturally, this is not good for fuel economy. Everyone knows that. I was originally going to use a Nitto Terra Grappler, but I have friends with the tire that are disgusted with their new MPG's. So now I'm tempted by the Nitto Dura Grappler since I drive mainly highway and rarely see dirt with this truck. My hopes is that going to this "highway terrain" Dura Grappler might keep me close to my current fuel economy. Does anyone have experience with this tire, or any input on the subject? There doesn't seem to be much info on this forum about this tire, so any help is appreciated. Thanks
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Old 08-30-2011, 08:47 PM
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Don't see how it is possible. Wider tire=more resistance because of more rubber on the road.
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Old 08-30-2011, 11:24 PM
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I'm not sure what the differences in those tires are, but generally with a typical all terrain tire mpg won't be too bad. I have stock size cooper zeon ltz's on my truck, and they are about 15 lb heavier at each corner, and my mpg didn't change at all, they are also a much more aggressive tread over stock. I'm sure if you went with more of a "mud tire" the mpg would decrease significantly. The larger width will hurt mpg, but I don't think the roughly 2 inches would make a drastic difference, maybe 1 or 2 mpg AT MOST, at least that's what I think....I ran much wider tires than stock on my old s10, mpg didn't change at all, and that was with a 4 cylinder.

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Old 08-31-2011, 11:12 AM
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I've run 29"'s(9something"), 31"s (10.5"), 33"s(12.5") and 35"s(12.5") on my Jeep over the years. I changed gearing when I went to 35"s, and I only ran 33"s for a somewhat short period of time with stock gearing, but the important part we're talking about here is the section width. I've also run everything from street, to AT to MT tires over the last 16 years. I'm new to the Ram, but I think my tire experience is generic.

Taller tires, without changing gearing, generally means a mildly better mpg on the freeway, your tires are also gears, bigger gear, less work once rolling...

Wider tires, gearing aside, generally means more contact patch with the road, which means more resistance. The type of tire matters too, even with more contact patch an AT is better than a similarly wide MT with big lugs even though it has less contact patch.

Mud terrain vs all terrain vs street. Street tires, obviously, are the best for the street. They have water channels, generally less sidewall for stiffness, and being designed specifically for the road, work very well in that environment and will give you the best fuel economy of the lot.

All terrain type tires would come in next. Leaving out width and speaking specifically about tread, all terrains generally don't have large voids and you often have a somewhat similar contact patch to street tires, however they are terrible at redirecting water. The small voids also means a generally quiet ride, though it is a bit louder than street tires.

Mud terrains are the worst of the lot, large voids, big lugs, absolutely no ability to channel water. They will give you the worst on street handling, the lugs will flex, the voids are large and make for a lot of road noise, worse depending on brand. They will wear out a lot faster than AT's or street tires if you're driving mostly on the street, and most of us are, so take that into consideration; not to mention that they cost the most out of all the different types of tires.

If you are keeping stock height, I'd say keep stock width as well and if fuel economy is important, stick with an AT. Just my 2 cents.
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Last edited by unrealtrip; 08-31-2011 at 11:15 AM.
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