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  #11  
Old 03-06-2012, 01:22 AM
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I noticed a difference in losing MPG going from 275/60 to 305/55. that extra 2 inchs width got me
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Old 03-07-2012, 03:17 AM
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Quote:
Originally Posted by seltzer View Post
Well, airflow tests have proven that the rake that everyone (myself included) cannot stand actually helps reduce wind reduction. And the generic tread factory tires are another benefactor in increasing MPG claims. Lifting a truck in the front increases wind drag, and larger diameter tires take more energy to get moving, weigh more..thus increasing rolling resistance, and the deeper tread design all take part in lowering ones MPG as a sum. It may not be much, but it is a factor...

I would say possibly 1-2, maybe 3 MPG loss...buts that's all just SWAG (scientific, wild ass guess)
Yep, raised the front with Bilstiens and lost 1 MPG straight out the window.
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Old 03-08-2012, 07:03 PM
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its not getting 8 mpg, the dtc is going to be off due to the fact that the speedometer/odometer is off. going from a 33" to a 35" tire makes a considerable differnce.
the speedometer differnece between a 285 70 17 and a 35 12.50 17 is 6.318% at 100 km/h,
if you travel 106.318 km the dtc thinks you only went 100 km. get a tuner and change the tire size you will see the mpg increase without even doing a tune, or at least i did on mine.
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Old 03-08-2012, 07:13 PM
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for gearing, on my 2011 there is a sticker on the bottom of the rear axle towards the driver's side tire. the sticker is on the underside of the axle and lists the gearing in bold. not sure if the 2012s are the same, but I would think so
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Old 03-08-2012, 07:55 PM
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How do you know its off alot? I check mine against my GPS which has MPH and seems pretty accurate. They probably cannot recal past what is available on the trucks stock. (uneducated guess)
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Old 03-08-2012, 10:06 PM
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Speaking of tires, can I put 35s on my stock 2500hd or would 33s be better?
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Old 03-08-2012, 10:21 PM
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35's are actually only an inch bigger than 33's. One inch goes on top, one inch on bottom...which is another popular misconception with tires. Technically they are 2 inches bigger except in the respect of clearance.
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  #18  
Old 03-08-2012, 11:12 PM
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On my 98 cummins with 3.55 gears once I put the 35x12.50r20 toyo mud terrains I saw a decent gain in mpgs of the 295/75/16 bfg a/t's that I had on it before. The reason for the increase is that the 24v cummins made peak torque at around 1800 rpms, my cruising rpm after bumping up the tire size was 1800 rpm's so my motor was operating at it's optimum rpm while under a steady load.

That truck got 20mpg with 35" mudders and a 6" lift. I can't imagine that the newer motors can't do better especially after a dpf/egr delete and a tuner.
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Old 03-10-2012, 03:16 PM
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My buddy put 35 TA/KOs on his. They look awesome. If he didnt live 200 miles away I would go get a picture ...lol
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Old 03-13-2012, 05:37 PM
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Quote:
Originally Posted by Warlock III View Post
35's are actually only an inch bigger than 33's. One inch goes on top, one inch on bottom...which is another popular misconception with tires. Technically they are 2 inches bigger except in the respect of clearance.
35's are 2 inches bigger that 33's. one inch on top and one inch on bottom = 2 inches. you will however only get 1 inch lift going from a 33 to a 35
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