What are your HIGHWAY mpg's?

TejasRunner01 said:
I'd love to get some more people who are running 265/75r16's and see what there highways a looking like.
Click to expand...

Year: 2001
Tire Size: 265/75/16 BFG KO2 Load E
Gear Ratio if you know it: 4.10 (guess)
2WD or 4WD: 4WD
Modifications that affect MPG: 3" lift, front bumper, sliders, full size spare, trunk full of tools
Current highway fuel economy: 19.5mpg highway @ 65mph
Automatic or manual transmission: automatic
4 cyl or 6 cyl: V6
 
ltsr said:
Year: 2001
Tire Size: 265/75/16 BFG KO2 Load E
Gear Ratio if you know it: 4.10 (guess)
2WD or 4WD: 4WD
Modifications that affect MPG: 3" lift, front bumper, sliders, full size spare, trunk full of tools
Current highway fuel economy: 19.5mpg highway @ 65mph
Automatic or manual transmission: automatic
4 cyl or 6 cyl: V6
Click to expand...

I am impressed with the 19.5 mpg! For the weight of those E tires and the bumpers, I'd say that is pretty good! :trophy:

Anybody else want to chime in?
 
I'll Play....

***********************************
Year: 99
Tire Size: 285/70r16 (32x11.5r16)
Gear Ratio if you know it: 4.30
2WD or 4WD: 4wd
Modifications that affect MPG: 2 in lift
Current highway fuel economy: 16-17
Automatic or manual transmission: auto
4 cyl or 6 cyl: v6
***********************************
Year: 97
Tire Size: 265/70r16
Gear Ratio if you know it: 4.10
2WD or 4WD: 4wd
Modifications that affect MPG: STOCK
Current highway fuel economy: 20
Automatic or manual transmission: auto
4 cyl or 6 cyl: v6
***********************************

but in my defense... my 99 ALWAYS got 16-17 MPG freeway even before the tires...

calculation my 99 MPG....
252.9 Miles * 1.035 (3.5% larger tire) = 261.7515 Miles
261.5515 miles / 15 gal's = 17.4 MPG


*************
Doh, just look at full specs of my tire, it's both a 285/70r16 AND 32x11.5r16 so that's 3.6% OR 4.6% larger, I've been using 3.5% lets see what the larger would be?

calculation my 99 MPG....
252.9 Miles * 1.046 (4.6% larger tire) = 261.7515 Miles
261.5515 miles / 15 gal's = 17.6 MPG
*************
now, that only related to .2 MPG correction...
252.9/15 = 16.86 MPG... which is .74 MPG calculated increase...
So if I didn't calculate the correction, it's safe to say, better than 16.86
 
Last edited:
Year: 01'
Tire Size: 285/75R16 Kumho Road Venture AT51
Gear Ratio if you know it: 4.10
2WD or 4WD: 4WD
Modifications that affect MPG: 3-inch lift, AOR Hybrid Front Bumper (90-100lb?)
Current highway fuel economy: 17.5-19 MPG
Automatic or manual transmission: Auto
4 cyl or 6 cyl: 3.4L

Planning on changing A/F ration and Oxygen sensor, long overdue, pretty sure MPGs are going to go up, if only slightly.
 
Hepar said:
Curious how everyone who has changed tire size is calculating their mileage.
Click to expand...

I'll bite.
My speedo is 1-2mph off around 60-70mph(I have a gear driven Tacoma VSS, so my speedo isn't ran off the wheel speed sensors), so I just base it off my ODO Trip.
With bigger tires, you'll be traveling further than your ODO says, so fuel mileage will be under-estimated if you just go off your ODO.
Mine is still under actual speed, so my MPG numbers are also under-estimated(not that they're "estimated" at all).
1 MPH is 1.6% of 60 MPH. 1.6% of a 220mi tank of fuel is 3.52mi. So I am actually going 223.52 miles when my ODO says 220. Negligible for me, but would make a notable difference for guys with 315s doing their calculations based off what the ODO says- if their speedo is ABS sensor fed.
 
thegipper said:
I just use my Ultra gauge for MPG's. I've tested it's accuracy based on fuel added/mileage traveled and it's dead on.
Click to expand...

I also use my ultra gauge. The key to getting good highway mileage is keeping it at 65mph or under. It's really that simple.
 
Year: 99
Tire Size: 285/70R17 Hankook Dynapro MT's
Gear Ratio if you know it: Factory 4.56
2WD or 4WD: 4WD
Modifications that affect MPG: 2.5-4.5 inch lift, SW FB 90lbs
Current highway fuel economy: 18 MPG (I average 16.5)
Automatic or manual transmission: Manual
4 cyl or 6 cyl: I4 3RZ

I used to get 23 on the highway in stock form.
I was averaging 18.5 for 10 years on 275/70R16's on stock 99 talls.
 
SnowLizard said:
I'll Play....

***********************************
Year: 99
Tire Size: 285/70r16 (32x11.5r16)
Gear Ratio if you know it: 4.30
2WD or 4WD: 4wd
Modifications that affect MPG: 2 in lift
Current highway fuel economy: 16-17
Automatic or manual transmission: auto
4 cyl or 6 cyl: v6
***********************************
Year: 97
Tire Size: 265/70r16
Gear Ratio if you know it: 4.10
2WD or 4WD: 4wd
Modifications that affect MPG: STOCK
Current highway fuel economy: 20
Automatic or manual transmission: auto
4 cyl or 6 cyl: v6
***********************************

but in my defense... my 99 ALWAYS got 16-17 MPG freeway even before the tires...

calculation my 99 MPG....
252.9 Miles * 1.035 (3.5% larger tire) = 261.7515 Miles
261.5515 miles / 15 gal's = 17.4 MPG


*************
Doh, just look at full specs of my tire, it's both a 285/70r16 AND 32x11.5r16 so that's 3.6% OR 4.6% larger, I've been using 3.5% lets see what the larger would be?

calculation my 99 MPG....
252.9 Miles * 1.046 (4.6% larger tire) = 261.7515 Miles
261.5515 miles / 15 gal's = 17.6 MPG
*************
now, that only related to .2 MPG correction...
252.9/15 = 16.86 MPG... which is .74 MPG calculated increase...
So if I didn't calculate the correction, it's safe to say, better than 16.86
Click to expand...

Haha I love your detail! Yes it wasn't much of a difference but a difference none the less! Thanks for your reply. Keep 'em coming!
 
Hepar said:
Curious how everyone who has changed tire size is calculating their mileage.
Click to expand...
Since I went from 225/75-15 tires to 265/70-17 tires, there is approximately a 13% difference in rolling diameter of the tires. I have a Dakota Digital speedometer calibrator adjusting for that so that my speedometer reads exactly the same (GPS verified) as the original tires. That way, I can continue to use the odometer for miles travelled, just like before.

-Charlie
 
Year: 2000
Tire Size: 275/70/17
Gear Ratio if you know it: 4.10s????
2WD or 4WD: 4WD
Modifications that affect MPG: SS 1.2 Lift ~ 3.5" front ~4.5 rear
Current highway fuel economy: AVG 16.6 MPG
Automatic or manual transmission: auto
4 cyl or 6 cyl: 6cyl
 
Wow 56 posts, consider me impressed! I'd love to hear some more from people running P/SL rated tires in at least a 32, what is your highway MPG?
 
1999 4Runner Limitedn w/ 200k

It all makes sense - tune, tires, gearing and year model are the variables.

I'm getting 17mpg on average with a '99 model at 200k, clearly not as refined as a later model 3rd gen, much less even newer years.

My 2003 Tundra gets closer to 19 or 20 with the same engine and almost same mileage. Tweaks are what get anything more.

I gotta keep it under 70 on the freeway if I want any better fuel mileage.
 
Best so far is 20mpg, my drive to work is almost 40mi one way. Normally it's no traffic one way, and stop and go (1hr 20) on the way home. Last tank was 19.4, both of which were minimal around city driving. 98 Limited w/320k, stock everything, vehicle is new to me.


Sent from my iPhone using Tapatalk
 
I'll bite:

Year: 2001
Tire Size: 315/75R16
Gear Ratio if you know it: 4.10
2WD or 4WD: 4WD
Modifications that affect MPG: Bumpers, roof rack, tires, etc
Automatic or manual transmission: Auto
4 cyl or 6 cyl: 3.4 V6
Current highway fuel economy: ~19 (on summer fuel)
 
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