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Old 04-23-2013, 02:47 PM   #1
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13 mpg

i bought 4 tires Toyo Open Country AT2 size 265/70/17 about a month ago and realised i could only travel 400 km with a full tank, thats about 17.5 L/100km.
is it just the tire size that's f*(*?ing things up ?
if it is, how can you calculate the exact mpg ?
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Old 04-23-2013, 02:50 PM   #2
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Check my fuelly stats for comparison. I usually get 15-16mpg city in winter. I did get 13.5 once with lots of idling and -30C.

In winter, I won't go far past 400km until the light comes on.

What load range are your tires? PSI? etc.

Also, when you calculate mpg, you have to account for the size difference. About 3.6% if I'm not mistaken in your case. In reality, you are actually getting a bit better mileage if you did not take that into account. Maybe mid 14's I'm guessing and that is not too much off considering winter gas blend and cold temps still outside.
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Old 04-23-2013, 03:07 PM   #3
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The tire size f*&ks everything up. I upsized from 265/75/16 to 285/75/16 and that increased the tire size from about 31 to 33 and the weight per tire from in the 30s to in the 50s.
The increased tire weight isn't like adding 80lbs in the bed. Its much worse. It eats up rotational force to get those fatties moving, so it takes more power to get going and more brake to stop.
With regards to mpgs, you need to take the new diameter and divide it by the old diameter, and then you will get the percent increase per tire rotation. I normally multiply my total tank miles by that number to calculate true mileage.
i.e. 33"/31" = 1.06 => 6% increase in circumference (pi x diamter) => 6% further traveled than the gauges think. My tripometer says I went 237 miles on 17.8 gallons (237/17.8=13.3mpg) then I multiply that by 1.06 for the increased distance per tire rotation and get a true mileage of 14.1.
My mileage is so bad because I've added a s&^t-ton of weight and screwed up my aerodynamics by adding an aftermarket bumper/winch/supercharger and skids. I also frequently carry heavy and bulky loads for work, which doesn't help mpgs.
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Old 04-23-2013, 03:15 PM   #4
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OP, Your tire diameter increased by 3.3%. So you need to account for that.

http://www.tacomaworld.com/forum/tir...0r17-265-65r17
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Old 04-23-2013, 03:19 PM   #5
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Quote:
Originally Posted by tacotac View Post
i bought 4 tires Toyo Open Country AT2 size 265/70/17 about a month ago and realised i could only travel 400 km with a full tank, thats about 17.5 L/100km.
is it just the tire size that's f*(*?ing things up ?
if it is, how can you calculate the exact mpg ?
Seriously?...

Well you take your mileage and divide it by how much has you use...
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Old 04-23-2013, 03:19 PM   #6
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Quote:
Originally Posted by kryten View Post
Check my fuelly stats for comparison. I usually get 15-16mpg city in winter. I did get 13.5 once with lots of idling and -30C.

In winter, I won't go far past 400km until the light comes on.

What load range are your tires? PSI? etc.

Also, when you calculate mpg, you have to account for the size difference. About 3.6% if I'm not mistaken in your case. In reality, you are actually getting a bit better mileage if you did not take that into account. Maybe mid 14's I'm guessing and that is not too much off considering winter gas blend and cold temps still outside.
30 psi now
this winter i had the same mpg but with standard tire size (265/65/17)
with -20 i think it's normal. But now summer is long gone, 12 degree c at the moment.
i didn't take the difference of size in my calculation, didn't know how
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Old 04-23-2013, 03:22 PM   #7
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Quote:
Originally Posted by teneighty View Post
Seriously?...

Well you take your mileage and divide it by how much has you use...
seriously?
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Old 04-23-2013, 03:27 PM   #8
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I'm running Toyos in 265/70/17 as well, but the MTs rather than ATs. According to my GPS, when my speedo is reading 65 mph, I'm actually doing 67.5. As I'm primarily highway driving, that 2-1/2 mph difference is what I figure in when doing my usage calcs. Depending on wx, I average between 16-17 mpg normally. Less if I go to town obviously.

Edit: Also, I'm running 35 psi.
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Old 04-23-2013, 03:30 PM   #9
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Quote:
Originally Posted by teneighty View Post
Seriously?...

Well you take your mileage and divide it by how much has you use...
Maybe I'm missing something...
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Old 04-23-2013, 04:00 PM   #10
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Quote:
Originally Posted by Mikehole View Post
The tire size f*&ks everything up. I upsized from 265/75/16 to 285/75/16 and that increased the tire size from about 31 to 33 and the weight per tire from in the 30s to in the 50s.
The increased tire weight isn't like adding 80lbs in the bed. Its much worse. It eats up rotational force to get those fatties moving, so it takes more power to get going and more brake to stop.
With regards to mpgs, you need to take the new diameter and divide it by the old diameter, and then you will get the percent increase per tire rotation. I normally multiply my total tank miles by that number to calculate true mileage.
i.e. 33"/31" = 1.06 => 6% increase in circumference (pi x diamter) => 6% further traveled than the gauges think. My tripometer says I went 237 miles on 17.8 gallons (237/17.8=13.3mpg) then I multiply that by 1.06 for the increased distance per tire rotation and get a true mileage of 14.1.
My mileage is so bad because I've added a s&^t-ton of weight and screwed up my aerodynamics by adding an aftermarket bumper/winch/supercharger and skids. I also frequently carry heavy and bulky loads for work, which doesn't help mpgs.
thanks man
if i calculate the way you did it, it only gives me 13 km more on a full tank.
giving that my tire size is incrased by 3,4%.
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Old 04-23-2013, 04:01 PM   #11
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Quote:
Originally Posted by Bobbb View Post
I'm running Toyos in 265/70/17 as well, but the MTs rather than ATs. According to my GPS, when my speedo is reading 65 mph, I'm actually doing 67.5. As I'm primarily highway driving, that 2-1/2 mph difference is what I figure in when doing my usage calcs. Depending on wx, I average between 16-17 mpg normally. Less if I go to town obviously.

Edit: Also, I'm running 35 psi.
that's pretty good mpg
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Old 04-23-2013, 04:05 PM   #12
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Quote:
Originally Posted by tacotac View Post
seriously?
That's when a junior gets to take advantage of a senior and tell him to read the entire thread before commenting.
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Old 04-24-2013, 05:19 AM   #13
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Quote:
Originally Posted by Mikehole View Post
The tire size f*&ks everything up. I upsized from 265/75/16 to 285/75/16 and that increased the tire size from about 31 to 33 and the weight per tire from in the 30s to in the 50s.
The increased tire weight isn't like adding 80lbs in the bed. Its much worse. It eats up rotational force to get those fatties moving, so it takes more power to get going and more brake to stop.
With regards to mpgs, you need to take the new diameter and divide it by the old diameter, and then you will get the percent increase per tire rotation. I normally multiply my total tank miles by that number to calculate true mileage.
i.e. 33"/31" = 1.06 => 6% increase in circumference (pi x diamter) => 6% further traveled than the gauges think. My tripometer says I went 237 miles on 17.8 gallons (237/17.8=13.3mpg) then I multiply that by 1.06 for the increased distance per tire rotation and get a true mileage of 14.1.
My mileage is so bad because I've added a s&^t-ton of weight and screwed up my aerodynamics by adding an aftermarket bumper/winch/supercharger and skids. I also frequently carry heavy and bulky loads for work, which doesn't help mpgs.
There is no way this can be accurate... There are to many factors to take into account. And if your getting bad mpg with 265/70 it's your driving habits.
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Old 04-24-2013, 05:47 AM   #14
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Quote:
Originally Posted by teneighty View Post
There is no way this can be accurate... There are to many factors to take into account. And if your getting bad mpg with 265/70 it's your driving habits.
it is accurate. i'd usually add the 6% to the mileage, then divide by the gallons used, but it works to the same number. if you read, he's not running 265/70's and also states he has aftermarket bumpers, winch, supercharger, skids, etc that all attribute to the lower mpgs.
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Old 04-24-2013, 08:03 AM   #15
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i just upgraded to the toyo open country at 2 LT265/75/16 from the stock duflops P245/75/16.....i was getting 21 mpg (mostly highway driving)....i'm now getting between 18-19...not too bad
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Old 04-24-2013, 02:08 PM   #17
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Quote:
Originally Posted by teneighty View Post
There is no way this can be accurate... There are to many factors to take into account. And if your getting bad mpg with 265/70 it's your driving habits.
i drive within the speed limits ,which is pretty slow, and i'm pretty damn smooth with the pedal. So i can't explain it, but i'm at 14 mpg with 265/70.
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Old 04-24-2013, 02:31 PM   #18
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My truck came new with 245-75R16 Dunlop Grand Trek tires which were fair on the pavement but I had a rock poke through the tread the first time I went off-road. I wanted to get something more agressive anyway as the stockers had poor traction in rocks, but had hoped to go at least 10k on the stock wheels and tires.
So at 3k miles I bought a set of Konig 16x8 wheels because I like the style AND they are light. I put 265/75R16 Dura-Trac tires and my fuel mileage is as good as stock when highway driving. Around town I really dont know as I use my triuck for off-road and getting to off-road stuff only. (Not a daily driver). I think tire/wheel weight is more important that most folks realize. PLUS you may be better with 4.10 or 4.56 gears once you step up the 33" tires (285/75R16 or 285/70R17).

As for my results I attribute it to keeping the cruise set to 70 mph and the light wheels. Also pump those tires up to 40 PSI to lower the rolling resistance. Max pressure is on the sidewall, don't exceed it even when the tires get hot.
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