4cyl 2nd gen Tacoma mpg loss moving from 245/75/16 tires to 265/75/16 tires

I know i know, this topic has been asked a thousand times. Ive searched and read for months now. I cant find a just straight up answer. I have a 2.7, 4x4, 5spd. It killing me having the little tires.... Im going to purchase some michelin ltx m/s2 tires soon so i need to figure this out. Thankyou for your time and help.

 

I would think maybe 1 to 2 mpg tops. But I could be wrong

 

I dont drive slow now and i get approx. 19-20 mpgs, id happily slow it down if i could stay near that.

 

Be sure to get the lightest tires possible for minimal effect on mpg. Look for P-load if you a don't off road where sidewall damage is a risk. Otherwise C-load. Tirerack has great specs with weights to compare your current tires with what you are looking at for a replacement.

Also when calculating your mpgs with the new tires, keep in mind that they are roughly 5% bigger, meaning you went 5% farther than your trucks odometer reads, so if you do the math and determine you are getting 19mpgs, it is really 20.

 

The drag from wider tires is significant and for a four cylinder, it means worse gas mileage. Unfortunately there is little offered in a taller tire of the same width. I would only consider 265/70-16. When you start chasing the larger tire look, you start loosing what ever advantage a four cylinder has.

 

2000 2.7l extcb prerunner auto with the same tire size you are looking at getting 22/23 mpg. You should expect 1 to 2 mpg loss due to 4x4. Hope this helps

 

I made that change on mine. Any noticeable change in gas mileage that I saw was due to the change in odometer reading caused by the larger diameter tire. FWIW, my tires are load range E, with a M&S tread pattern. The gas mileage has been steadily over 25 mpg for mountain roads, highway and city driving. IMO the biggest effect on gas mileage is driving habits.

 

Or you could go with 235 85 16 that is narrower and taller than a 265 75 16. I get 22mpg on two lane 55mph roads with this size in cooper discoverer at3's. Better than when I was running 245 75 16 yokohama geolander ats.

 

I lost 20-25% across the board going from 245 to 265 in a mild all terrain, Cooper ATP.

Average dropped from 23/24 to 18. My best MPG on 245s was 28 MPG. That same exact trip with a similar load on 265s was 21 MPG, which is the new best with this tire size.

I also was lifted 1.75", so that accounts for some change in MPG (possibly), but increasing from 1.75" front/2" rear lift to 2.5" front/2.75" rear hasn't changed my MPGs at all, even with a shell.

Food for thought.

DCSB 2.7 auto Prerunner.

 

Our 2.7L engines bitch and moan if you use ANYTHING bigger than stock. I love the 2TRFE but dear God does it lack power.

 

There is a reason why a Prius doesn't come with anything but cookie cutter tires. People buy a 2.7 for economy, then defeat the whole purpose of it with larger tires......just trade the 2.7 vfor a six and have at it. We Guys, I admit to it too, have the same fetish about tires that women have about shoes. Guys try to put fat tires on trucks cause it looks good like some women put their fat feet in high heals cause it looks good. Both pay for it in the end.

 

I appreciate all the replys. Ive had a couple of jeep wranglers, and several full sized pickups in the past, so i understand the science behind the bigger tires. I understand that they cause more drag and have more surface contacting the road, and that they weigh more. Im not wanting an aggresive tire only and all season tire.... Michelin LTX M/S2. I did buy the 4cyl for fuel economy and id like to not lose any economy i currently get 19-20 combined mostly highway rpms around 3k the whole commute. It is a truck tho and it needs wider atleast if not taller tires. I appreciate all the replys and would really like to hear from the 2.7 owners who have made this change.

 

I had a gen 1 2.7 went the larger tire route. I did loose mileage but we had horrific mud season and it was worth the trade off. They will take potholes better too. If tha's not you, it will at least look better to you. 265-70/16 is an acceptable factory authorized optional size. In all season, they will ride better. Those are the trade offs.

 

I don't know if you will get a definitive answer; probably too many variables. I kept 245/75s on my 2010, but switched from the AT20s to a heavier (by 5lbs) and slightly wider Michelin. MPG stayed the same, even tho they were wider and heavier. I just went thru the same search process you mention because I want to put 265/75s on my 2015. After wading thru thread after thread after thread, I decided to get C rated Cooper AT3s in 265/75. They're on their way. What will be, will be.
Probably a lot of truth in azreb's post:

 

It is annoying when people don't account for the larger rolling diameter of larger tires. Your speedometer is not recalibrated so to complete one rotation of the tire you are in fact traveling further.

Not to include the rolling mass of the tire is probably 5-15 lbs. heavier, especially if the tire is a 10 ply. Not much in the grand scheme, but that added mass needs to be rotated by the driveline.

 

Millerman- You may want to read this thread, gives some insight on what you're asking about.
//www.tacomaworld.com/threads/slightly-wider-tires-245-v-265.388285/

Knew I'd seen this before, just couldn't remember where. Some good stuff in the 4 Cyl forum...

 

Well i pulled the trigger. I couldnt wait any longer. I had a set of the new kumho road venture at 51 tires put on today. Its amazing the difference a little taller, and wider tire made to the looks of the truck. I went with the 265/75/16. Have only driven about 40 miles so far so ive not been able to gather any mpg figures yet. Ill take a few pictures tomorrow and post them, and as soon as i get the mpgs figured out on a couple tanks ill post those numbers.
By the way they have a great rebate on these tires right now $120 visa card by mail.

 

Went from oem dunlops P245/75-16 to Michelin LTX MS2 in same size. Recalibrated ScanGauge by GPS. Between worn old tires and Michelin's being .4 inch wider tread mpg went down about 1 mpg.

 

Went up to the 235x85 and they gobble some extra gas....some loss in power too. However, they pull good, look good and most of all NO flats.

 

I'll be interested to know how you like those Kumho's. I've been considering those. Weight of the tire affects mileage too. I had a 2.7 5/spd 4x4 05 for 105k that I bought brand new. Ditched the 245's at about 5k miles for 265/70/16 Michelins. No change in mileage. But I hated the tires and dealt with them for 70k long miles before I could justify replacing them. Put on General Grabber AT2's in the same size. Lost 1.5 MPG and it was noticeable difference in power too. Honestly with those tires I got worse mileage than I got with my current V6/auto when it had 245's on it.