12-20-2017, 12:34 PM
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#46
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Join Date: Aug 2010
Location: Seattle, WA
Posts: 7,712
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Location: Seattle, WA
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Curious how everyone who has changed tire size is calculating their mileage.
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2001 4Runner 4WD Sport Package, Millennium silver, 110,000 miles, 2nd gen TRD Supercharger, Toytec BOSS coilovers, 890 OME rear springs, Bilstein 5125 rear shocks, custom Baldlands front bumper, PIAA 520 driving lights and fogs, 4x Innovation Sliders (welded on!), 18" Magnaflow muffler, JDM corners, 65" Thule bars, 20% tint, 16x8 FJ80 wheels on 265/75-16 Duratracs, Husky mats w/ cargo, rear diff breather mod, 3M clear bra, remote start, Pioneer AVIC-8200NEX
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12-20-2017, 12:40 PM
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#47
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Member
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Join Date: Jul 2016
Location: Pennsylvania
Posts: 90
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Member
Join Date: Jul 2016
Location: Pennsylvania
Posts: 90
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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.
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12-20-2017, 01:54 PM
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#48
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Senior Member
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Join Date: Nov 2014
Location: The Great PNW
Posts: 2,016
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Senior Member
Join Date: Nov 2014
Location: The Great PNW
Posts: 2,016
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What are your HIGHWAY mpg's?
Quote:
Originally Posted by Hepar
Curious how everyone who has changed tire size is calculating their mileage.
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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.
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12-20-2017, 01:56 PM
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#49
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Senior Member
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Join Date: Mar 2016
Location: West Bend, WI
Posts: 2,339
Real Name: Mike
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Senior Member
Join Date: Mar 2016
Location: West Bend, WI
Posts: 2,339
Real Name: Mike
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Quote:
Originally Posted by Hepar
Curious how everyone who has changed tire size is calculating their mileage.
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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.
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1997 SR5 4x4 Auto, 99' tall coils up front, OME 906's, Truetrac LSD, Airaid MIT
1999 SR5 4x4 Auto for parts
2011 Camry SE V6
2011 Highlander Limited
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12-20-2017, 02:05 PM
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#50
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Elite Member
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Join Date: Mar 2006
Location: Monroe, NY
Posts: 5,706
Real Name: Scramble
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Location: Monroe, NY
Posts: 5,706
Real Name: Scramble
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Quote:
Originally Posted by TejasRunner01
I wouldn't mind a 4 cylinder 5 speed 4x4 3rd Gen as a 2nd vehicle. I've heard it is a fun little combination. Anybody else?
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I wish I had pics of me doing burnouts.
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'99 4Runner - 2.7L 3RZ, 5 Speed, 4.56 Gears - Lifted, Locked & Loaded - 166k Original owner - http://www.toyota-4runner.org/3rd-ge...ld-thread.html
'99 Limited - E-Locker- Stock (for now) - 233k 2nd Owner http://www.toyota-4runner.org/3rd-ge...ted-build.html
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12-20-2017, 02:13 PM
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#51
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Join Date: May 2014
Location: Orange County, CA
Posts: 354
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Join Date: May 2014
Location: Orange County, CA
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Quote:
Originally Posted by thegipper
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.
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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.
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12-20-2017, 02:17 PM
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#52
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Elite Member
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Join Date: Mar 2006
Location: Monroe, NY
Posts: 5,706
Real Name: Scramble
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Elite Member
Join Date: Mar 2006
Location: Monroe, NY
Posts: 5,706
Real Name: Scramble
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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.
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'99 4Runner - 2.7L 3RZ, 5 Speed, 4.56 Gears - Lifted, Locked & Loaded - 166k Original owner - http://www.toyota-4runner.org/3rd-ge...ld-thread.html
'99 Limited - E-Locker- Stock (for now) - 233k 2nd Owner http://www.toyota-4runner.org/3rd-ge...ted-build.html
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12-20-2017, 02:51 PM
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#53
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Join Date: Jan 2017
Posts: 377
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Join Date: Jan 2017
Posts: 377
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Quote:
Originally Posted by SnowLizard
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
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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
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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
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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!
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12-20-2017, 03:56 PM
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#54
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Elite Member
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Join Date: Mar 2016
Location: Pasadena, CA
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Quote:
Originally Posted by Hepar
Curious how everyone who has changed tire size is calculating their mileage.
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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
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'99 4Runner SR5 Auto - 4WD swapped
'89 Camry Alltrac LE 3S-GTE 5spd
'17 Chevy Volt Premier
'16 Honda Odyssey Elite
Previous: '88 Camry Alltrac LE 3S-GE BEAMS, 90 Camry 3S-GTE, 90 Camry DX, '03 WRX wagon, '08 Outback XT
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12-20-2017, 10:53 PM
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#55
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Posts: 377
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Awesome replies. Any body else?
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12-21-2017, 12:27 PM
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#56
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Join Date: Jul 2014
Location: Wilmington, NC
Posts: 889
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Join Date: Jul 2014
Location: Wilmington, NC
Posts: 889
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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
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2000 4Runner SR5 Sport
1998 Lexus LX470
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12-21-2017, 06:19 PM
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#57
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Posts: 377
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Member
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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?
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12-22-2017, 09:29 PM
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#58
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Join Date: Oct 2015
Location: Knoxville, TN
Posts: 266
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Member
Join Date: Oct 2015
Location: Knoxville, TN
Posts: 266
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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.
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Bstrom of Powell, TN
2003 Tundra | 1999 4Runner Limited 4WD | 2011 Mazda CX-7 Sport
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12-22-2017, 10:06 PM
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#59
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Join Date: Nov 2017
Location: Inland Empire, Ca
Posts: 35
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Member
Join Date: Nov 2017
Location: Inland Empire, Ca
Posts: 35
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What are your HIGHWAY mpg's?
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.
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12-22-2017, 11:46 PM
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#60
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Join Date: Mar 2014
Location: Fort Collins, CO
Posts: 640
Real Name: Hayden
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Member
Join Date: Mar 2014
Location: Fort Collins, CO
Posts: 640
Real Name: Hayden
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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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