99grnrunner

Was wondering if anybody had done the research or leg work of figuring how bad the upgrade to 285's from 265's is on 3.4L gas mileage? Just want to have an idea before I go through with it. thanks

Localmotion

i didnt notice any at all..still getting about 230/tank

The loss of power is significant though. I think thats the only reason why i didnt go 295s. i have 4.10s

dragr1

iTrader: (3)

What's gas mileage? :cry:

t100

im not to sure.. i thought it was where you could go far on gas, i cant make it to walmart without getting gas

dragr1

iTrader: (3)

Well then I got you beat 'cause I can make it there, but then I spend all of my money there and have no gas money to get home!

SEAN_at_TLT

My mileage went up recently when I switched to 35's from 33's. I regeared the axles to 4.88 some time ago and my hwy rpm's were suffering with 33's. Now that the gearing is spot-on I am pulling almost 17 freeway and the same ~13 city as I've always got. I got over 275 miles out of tank on my last road trip, I was stoked!

Sorry if my American tire size measurements are confusing but with metric tire diameters changing based on the rim size I feel that describing a tire should be done in diameter not section width. Metric sizes such as 265 or 285 refer to the width of tire in mm's not the height. Even if the sidewall is exactly the same number (70 for example) the tire diameter will be different based on the rim size (a 305/70/16 is a 33x12" and a 305/70/17 is a 34x12" for example). Although most here on YT assume a 16" rim as that is fairly std for the 3rd gen runners in stock form. The only other issue is that most American sized tires are rated incorrectly, for example BFG 35/12.5's measure out to closer to 34/12" on an 8" wide rim.

I like to use the metric tire size convertor on 4lo.com to convert to an American measurement and then use those numbers when referring to gearing or acceleration questions.

zero4

295s? Interesting. Who makes those? I've only heard of 295s in size 20's and 22s.

Localmotion

Nitto makes the terragrappler and the mud grappler in 295s

Filthyrich just got a new pair of 295 nittos

dragr1

iTrader: (3)

I believe there is also a 295 BFG A/T.

FilthyRich

that and the Nitto Terra Grappler are the only two that I know of in 295/75/16

jacksonpt

FWIW... I think MPG is affect more by tire type (AT vs MT, etc.) than it is tire size. You could go up a size and not notice much affect on mpg if you stick with the same type of tire. However, if you stick with the same size and go from an AT to an MT, you'll probably notice a loss in mileage.

I say this because I went from 28" ATs to 32" ATs and noticed virtually no change in gas mileage (city mpg dropped by about 1mpg, highway actually went up by about 2mpg). Then I went from 32" ATs to 33" MTs and my mileage went down the crapper - I get about 15-16mpg.

HarrisonP

99 Did you go to Wando high a few years back?

NC-B17A

To you guys that are claiming better gas milage with bigger tires
How do you know what gas milage you are getting?
It is accepted that 33's & 4.88's go hand in hand to be close to OEM specs IE your speedo & odometer are almost correct.
SEAN_at_TLT your odometer is turning slower with the 35's then it was with the 33's with the same gearing. Unless you did something to correct the difference otherwise. I am under the impression that you can have this corrected at the dealer but is around $150 so most ppl for go this route.
I'm not saying that you aren't getting better milage, if you drive on the interstate you should be getting better milage at higher speeds.
I'm just curious as to how you guys acurately figure milage.
:monkey:

99grnrunner

(did you go to wando high)

Reply:

sure did, did you? I notice the charleston under your name

HarrisonP

Yeah I graduated last year, I think I saw your truck at Peyton's on New Years

ErikJeanna

iTrader: (2)

I went from 19 mpg when running 31's to around 16-17 on my 33's. Power suffered as well.