Fuel Mileage After Larger Tires - 3rd Gen

If all else was equal, that amount of weight at the outer edge of the tire (worst case) would be a 4% increase in the energy needed to accelerate and decelerate at the same rate. If you didn't use your brakes, you'd get it all back. For all other conditions it would be like adding 120 lbs anywhere else on your truck. If you accelerate hard and slam on your brakes and drive at low speeds all the time; maybe 2-3% more energy (gas)... probably small enough you wouldn't notice. If you are driving like that, you aren't concerned about mpg anyway. Normal driving, cruising and highway speeds it would be a lot less.

Rolling resistance (internal frictional losses from hysteresis) is a bigger variable, and the difference between tires can be >10% hit on total energy and gas at low speeds, and you'll get that hit even if you drive moderately.

 

I know my tires have very low rolling resistance for what they are, but Hankook no longer makes them. The AT2s are probably good, but I don't know.

If I needed new tires, I'd give these a serious look. It's 325/65r18 (same size I have), a fat "35" with a rugged design, but it's D load rather than E, and also T speed rated... and fairly light at 65 lbs. The limit for speed rating is dominated by temperature, and since rolling resistance correlates well with internal heat generation it's not bad proxy. I'm pretty sure it's the only 35" AT that is D load and T speed. Most are Q or R speed... only a couple are even up to S.

The downside is that it's a new tire though and might suck. I haven't seen any reviews of this size or tread pattern. Note that smaller sizes have a very different tread pattern and thinner tread, and they are spec'd OEM on some vehicles. I wouldn't expect reviews on those tires to be very relevant to this one.



https://www.tirerack.com/tires/tires.jsp?tireMake=Goodyear&tireModel=Wrangler+Territory+AT&partnum=265TR8WTAT&GCID=C13674x012-tire&KEYWORD=tires.jsp_Goodyear_Wrangler+Territory+AT_Tire&code=yes&ci_src=328768002&ci_sku=265TR8WTAT&ef_id=YpUbEAAFQcT_EwA2:20220615002352:s&AID=10398365

$298 each from Discount Tire Direct: https://www.discounttiredirect.com/buy-tires/goodyear-wrangler-territory-at

 

35x11.5 Toyo AT3. 16MPG on the computer, mostly highway a little city 25% l, highway all below 73. Speedo not corrected so I see that maybe 17/18 after correction. 73 on the dash is 77 GPS.

 

Thank you for sharing! I am having those installed this week.
Just did a road trip from Seattle to Boise and averaged 18.7 with my truck bed full of stuff from my house that I am moving

 

Edit. I just did my first long, mostly highway road trip. I went down Hwy 99 (flat) and then up Hwy 168 (very steep grade) and back. A total of about 300 miles. I average 70-75 mph and 18.6 mpg. I guess my hwy mpg's area better than I thought.

 

Hand calc 12.2 / truck reading 14
35/12.5/20 2” lift
Trd off road
Drive it in eco and hardly ever go over 2k rpm.

 

Most people are hand calculating higher numbers than the computer... ? Pretty sad either way. What tires?

 

My Platinum Hybrid was getting 21.6 mpg’s on stock tires after the first 1700 miles. Threw on 305/70r17 (34x12.2-E load/68 lbs each) and after 1800 miles I was averaging 18.1. Just recently changed tires to 285/75r17 (34x11.3-C load/59 lbs each) and after a couple hundred miles my computer says 18 mpg’s.

 

Please give the brand and model of tire, they are not all the same.

Also, you need to adjust the data when you change tire size. The computer thinks you are on stock size.

 

you happen to move to the Boise bench? One of our new neighbors down the street has a mgm platinum and haven’t met them yet.

 

35x11.5R20 (ReconGrapplers) on Factory TRD wheels ... mostly town driving... 15.5 on computer, up to 17-18 running 70 on a Interstate. I have a 6x12 trailer with sides / ramp that drops me down to ~12mpg, and 22' travel trailer that I get 10-12 on the flats, and 7-8 climbing.... I will say it pulls much better than my old 16' GMC 1500 did...

 

295x70r18 Falken Wildpeaks with the Westcott Pro lift, averaging about 15.
Highest I've seen is 17.5, lowest I've seen (other than driving it hard) was around 13.5.

 

Nope haha, but not far from there. I am actually moving into my house today, I'll message ya soon if you wanna grab a beer.

 

I have 275/70-18 all terrain tires on stock TRD wheels and I usually get 21-22 on the highway, got 24 mpg on a trip from Boise to Rawlins Wy. I drive around 70 on the highway. I can't really say I do city driving much as I work from home and live in a smaller town but my normal driving I get 17-18 mpg. I don't accelerate fast and I don't drive over 75 mph for the most part anywhere.

 

Which ones?

 

Man from Boise- Rawlins going 70-75mph is a death wish

 

Les Schwab Open Country AT's, load range E.

I was driving to Indiana to pick up a toyhauler so as painful as it was, that part of the drive was a helluva lot better than Rawlins to Indiana. I love road trips so it doesn't bother me and I got to camp in some pretty cool spots.

 

Do you mean Open Range? Open Country is a Toyo. https://www.lesschwab.com/open-rang...fn4=loadIndex&prefmin4=0&prefmax4=500&start=1

 

Sorry about that, yes Open Range. Probably because all I see is people talking about Open Country's. Honestly though, these tires are fantastic, ride great, do great off road and in the snow and they have the snowflake rating

 

Happy New Year ! Figured I would chime in on this thread. I have owned my 22' with the 8' long bed for over a year and have documented every fuel fill up since both prior to lift and after. I drive very conservatively and really try to get max MPG so after 46 fill ups and 21k miles on the truck, prior to lift I average 18.5mpg after my lift and calculating for larger tires am seeing 17.6mpg. Now after the lift in September to Oct 31st was averaging18.7mpg but since have been averaging 16.15mpgs in Colorado's winter. Details on my lift. I went with Icon front stage 1 front shock, they have the clip that you can adjust the height on shock prior to install. I went with the second clip height so I could clear 35" tires but not need a upper control arm swap. My front height stock was 36 1/4" from ground to below wheel well on center of tire. With front shock and tire height is now 39 1/8". The rear I went with Dobinsons 2.5" rear coil springs and Dobinsons IMS rear shocks, with Dobinsons track bar. Stock rear was 38 3/4" now with lift and tires is 42 5/8". Yes I wanted to be taller in the rear as I tow a lot and don't wont sag. Tires are the Wildpeak A/T3W 285/75/18.

 

How and where you drive the truck makes a big difference in mileage. Do the new springs help with heavier loads? Have you considered air bags as well? Truck looks great, is that the stock grille, I like it.

 

Indeed, around town in Fort Collins millage is terrible, have to have highway trips just to balance it out. Both Shocks and Springs improved the ride and stiffened up the corning significantly but certain sections of concrete highways have expansion joints that hit my wheel base just right to where it creates a mind numbing rhythmic shaking, once I get to 85mph that shake goes away, and so does mpg. The rear springs and shocks definitely helped with load and trailer sag, stock truck lost 2" with dry trailer, with lift 1/2" with my 16' x 8' deckover, with my 20'x 8' deckover I lose an 1" in the rear.

 

35 x 12.50 falkens and 17x8.5 methods and I have been getting around 16-17mpg mostly highway with them. Also still only have 1000 miles on the hybrid plus add winter fuel mileage so I’m pretty happy considering my previous 5.7 lifted was 11.6!!

 

2022 Tundra with Westcott lift, Method wheels +25, & Wildpeak AT3W 15x12.5x17

I get a whopping 14mpg mostly city w/ some hwy sprinkled in

 

I went from averaging in the 17 - 18 range stock on my '23 pro to around 14 - 15 after switching to BFG KO2 AT 35x12.5. Those are the computer readings without correction for the tires .. which is about 5%. I haven't done a manual calc yet. It's a bigger hit than I expected, especially on highway mileage. My average seems to tick up when driving shorter distances due to the hybrid.

 

35/12.5/20 Toyo R/T’s on Fuel wheels with a 3” lift. Mileage improved when I went to 50 psi. (Max is 65 on these tires)

First tank of fuel from new seeing 14-15 average.
Saw 19.5 average yesterday on highway trip now that I’m at 900 miles.
Average daily city trip to work is around 15.5
Transmission in normal mode and it is starting to learn to coast longer when lifting gas pedal. (And I’m learning how it responds while driving)
I see it improving with total vehicle mileage in the future like my 2019 Tacoma did.
Tacoma was lower mpg for the first 5000 miles.

 

So after correcting, ~15.2 vs 17.5. That is a huge hit. No lift? Also, how much has it declined on the highway?

I'm surely an outlier, but with the old inefficient 5.7 I'm doing as well as I ever did with stock tires and no lift. Hankook ATMs have been fantastic for rolling resistance, but I don't know if that is still true as they have been redesigned. The particular tires you choose can have a big effect!

I've taken two long trips since I did the lift. Mostly freeway at 75-80 and fairly flat, but ~1/3 on winding mountain roads with lots of elevation change. Wind was unkind (more headwind than tailwind) and not much drafting due to light traffic. Averaged 17.8 mpg the first time and 17.6 the other.

 

No lift. Highway is the worst. I need to do some manual measurements, especially on the highway to get an accurate difference. I didn't take much of a hit on my '15 when I went to 35 BFGs.

 

I’m running:
17s with a +12 offset
35x12.5x17 Toyo RT

accordig to the dash I’m getting about 13-14 mpg here in cali.

 

34'' Toyo AT3s

I'm getting 18 mpgs. Still significantly better than my 14 mpg in my tacoma.