Milage and Power

06BlueLimited · **Posted:** Tue Oct 16, 2007 5:03 pm

To the guys with tire size 240/70r16... what kind of milage do you get with this size tire and have you lost much power?

tommudd · **Posted:** Tue Oct 16, 2007 5:24 pm

Really I couldnt notice a real difference (with A/Ts ) , except it rode better, mileage wise no difference though, now I am sure if you went to a heavy mudder then it may....

06BlueLimited · **Posted:** Wed Oct 17, 2007 12:07 pm

I was thinking of going down to that size to help with power loss. I will probably still run an A/T though.

Pote · **Posted:** Wed Oct 17, 2007 12:47 pm

I noticed ZERO power loss but took a slight hit in MPG. I had an idea that worked out well with mine. When I had the stock POS tires I installed a CAI to gain whatever I could for mileage. I do 99% highway driving with my rig and needed to eek out every last drop. With the K&N CAI and stock tires I gained about 4 MPG. It rocked...but I knew I was going to be going to a larger 245/70 tire. Once the tires were on I lost about 2 MPG. With both those upgrades I still came out ahead and have the best of both worlds because the KJ rides sooo much better with the larger wider tires, and I still have MPG gains with the CAI. that's my experience so far. I love the 245/70 size on an unlifted KJ...looks perfect.

Now, there are other considerations. My aggressive AT tires weigh in at 35 pounds each. My stockers were 25 pounds each. Effectively adding 50 pounds for 5 new tires. Now if you go with a BFG KO or a General Grabber, those puppies weigh in at the top of their class, true heavyweight tires for an AT. I think the KOs are about 49 pounds each and the Grabbers are 45 pounds each...that's 10-14 pound more per tire again!! that being 20-25 pounds more per tire over stockers. 125 pounds more all around...that WILL make a difference.

I have heard that people are getting killed on the MPG going to either of those two really heavy tires. plus agressive tread produces more rolling friction. food for thought.

DarbyWalters · **Posted:** Wed Oct 17, 2007 1:21 pm

http://www.herculestire.com/hercules/pd ... TracAT.pdf

Here is a chart with some wieghts...I went with the 235/75/16s at just 33#/tire

scoobysnax · **Posted:** Wed Oct 17, 2007 2:06 pm

So if I go from my stock 235/70/16 Wrangler SR-A’s @32 lbs to a tire that is 245/70/16 Bridgestone Dueler A/T Revo’s @36lbs each I’m going to loose 2 mpg’s? I guess the weight difference is not as great as the example above so please tell me it won’t be that much. Is the effect more b/c of the weight of the tire and the effort it takes to rotate the extra mass or is more a result of a different more aggressive and wider tread pattern?

As it is I avg anywhere from 20 – 24mpg in just highway driving and anything from 13-16mpg in true (NYC) city driving. Will I feel that 2mpg loss more in city driving due to the constant adjustment to the rotation of the tire and the extra mass or more on the highway where the extra rotation mass could have a multiplying effect at speeds?

Pote · **Posted:** Wed Oct 17, 2007 2:19 pm

scoobysnax wrote:

So if I go from my stock 235/70/16 Wrangler SR-A’s @32 lbs to a tire that is 245/70/16 Bridgestone Dueler A/T Revo’s @36lbs each I’m going to loose 2 mpg’s? I guess the weight difference is not as great as the example above so please tell me it won’t be that much. Is the effect more b/c of the weight of the tire and the effort it takes to rotate the extra mass or is more a result of a different more aggressive and wider tread pattern?

As it is I avg anywhere from 20 – 24mpg in just highway driving and anything from 13-16mpg in true (NYC) city driving. Will I feel that 2mpg loss more in city driving due to the constant adjustment to the rotation of the tire and the extra mass or more on the highway where the extra rotation mass could have a multiplying effect at speeds?

well, going up 4 pounds is not that much. not like going up 10 pounds each or 20-25 pounds each with the KO/Grabber. I doubt you will see much of a decrease. But you will definitely take a bigger hit in the city due to stopping and starting with heavier, more roll resisting treads that are wider. Once driving on the highway and sustaining, it doesnt take nearly as much to keep the car rolling at cruising speed. Its the constant start and stop that makes a difference...but again, 4 pounds is negligible. thats only 20 extra pounds for 5 tires as opposed to 5 KOs increasing the wight by 100 lbs or so. 5X as much weight and seriously aggressive treads for simple city/highway driving.

Milage and Power

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