Go Back   EcoModder Forum > EcoModding > EcoModding Central
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 08-29-2012, 08:50 PM   #1 (permalink)
EcoModding Lurker
 
royanddoreen's Avatar
 
Join Date: Jun 2010
Location: glovertown nl canada
Posts: 85

z - '03 nissan 350z touring
90 day: 36.21 mpg (US)

Diniro - '18 Kia Niro Ex
90 day: 47.99 mpg (US)
Thanks: 34
Thanked 6 Times in 4 Posts
5% larger tires (effect on odometer/MPG calculations?)

If I am using 5% larger circumference tires wouldn't this mean instead of getting 30 mpg I would of actually traveled 31.5 miles meaning 31.5 mpg?

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 08-29-2012, 09:27 PM   #2 (permalink)
wrx4me...
 
Join Date: Jul 2012
Location: goode, va
Posts: 143

no worries - '91 Subaru legacy L
90 day: 31.45 mpg (US)

weevee - '08 suzuki vstrom dl650
90 day: 61.22 mpg (US)

wrx - '09 Subaru wrx sedan
90 day: 29.8 mpg (US)

Big Bright Green Pleasure Machine - '09 kawasaki ninja 250 se

Connie - '09 kawasaki concours
Thanks: 42
Thanked 7 Times in 7 Posts
Sounds right to me. Taller tires should should make the odometer show fewer miles traveled than actual and any mpg calculation based on the measured miles be under reported.
  Reply With Quote
The Following User Says Thank You to thomason2wheels For This Useful Post:
royanddoreen (08-30-2012)
Old 08-29-2012, 09:51 PM   #3 (permalink)
Master EcoModder
 
mcrews's Avatar
 
Join Date: Oct 2009
Location: Texas
Posts: 3,523

The Q Sold - '02 Infiniti Q45 Sport
90 day: 23.08 mpg (US)

blackie - '14 nissan altima sv
Thanks: 2,203
Thanked 658 Times in 474 Posts
yes, that is correct.
Which is why a scangauge is so wonderful.
It can be calibrated to the correct numbers.
I use my gps to get the exact distance traveled for my scangauge calibration.
As a note: I switch to metric on the gps and scangauge. It's more precise.
Then switch back to miles after setting it.
__________________
MetroMPG: "Get the MPG gauge - it turns driving into a fuel & money saving game."

ECO MODS PERFORMED:
First: ScangaugeII
http://ecomodder.com/forum/showthrea...eii-23306.html

Second: Grille Block
http://ecomodder.com/forum/showthrea...e-10912-2.html

Third: Full underbelly pan
http://ecomodder.com/forum/showthrea...q45-11402.html

Fourth: rear skirts and 30.4mpg on trip!
http://ecomodder.com/forum/showthrea...tml#post247938
  Reply With Quote
Old 08-30-2012, 09:47 AM   #4 (permalink)
Tire Geek
 
CapriRacer's Avatar
 
Join Date: May 2008
Location: Let's just say I'm in the US
Posts: 709
Thanks: 0
Thanked 289 Times in 181 Posts
Quote:
Originally Posted by royanddoreen View Post
If I am using 5% larger circumference tires wouldn't this mean instead of getting 30 mpg I would of actually traveled 31.5 miles meaning 31.5 mpg?
That assumes that the tires are otherwise the same. If you have a different make and/or model of tire, there will be differences in rolling resistance - and some of those differences can be large enough to offset any gain you get due to diameter.
__________________
CapriRacer

Visit my website: www.BarrysTireTech.com
  Reply With Quote
Old 01-20-2013, 02:50 PM   #5 (permalink)
EcoModding Lurker
 
royanddoreen's Avatar
 
Join Date: Jun 2010
Location: glovertown nl canada
Posts: 85

z - '03 nissan 350z touring
90 day: 36.21 mpg (US)

Diniro - '18 Kia Niro Ex
90 day: 47.99 mpg (US)
Thanks: 34
Thanked 6 Times in 4 Posts
I went from 26.7" o.d. Potenza re040 soft perfomance tires to 28" bridgestone blizzacks. The rr seems to be improved to my surprise and the lower final drive a bonus. The blizzacks are a lighter wheel tire package and my mileage has been improved greatly!!
  Reply With Quote
Old 01-20-2013, 05:57 PM   #6 (permalink)
EcoModding Lurker
 
Join Date: Aug 2009
Location: Hamburg, New York
Posts: 95

Samantha - '94 Ford Ranger XL
90 day: 14.04 mpg (US)

Cassidy - '12 Chevrolet Silverado W/T 4x4
90 day: 14.39 mpg (US)

Mustang - '06 Ford Mustang Convertible GT
90 day: 17.42 mpg (US)
Thanks: 3
Thanked 6 Times in 5 Posts
You might be seeing better gains than you think. You gotta find out the difference in circumfrence, not o.d. I put 225/75-15's on my ranger instead of 225/70-14's and those are under 2 inches taller. Go to a tire size calculator (just google search it) and enter your stock size and the new size and it will tell you what percentage it throws off your speedometer (and therefore your odometer). In my case that less than 2 inch o.d. Was worth 7.11%, so now when I enter my mileage I multiply the odometer reading by 1.0711 and get actual miles driven
  Reply With Quote
Old 01-20-2013, 06:25 PM   #7 (permalink)
GRU
Master EcoModder
 
GRU's Avatar
 
Join Date: Oct 2011
Location: Windsor ON Canada
Posts: 373

silver bullet - '00 Honda Civic
90 day: 34.41 mpg (US)
Thanks: 21
Thanked 36 Times in 31 Posts
The stock odometer may not be accurate...do a gps distance run and see what your odometer shows compaired to gps distance....gps speed to speedometer is not the same as distance
__________________

  Reply With Quote
Old 01-20-2013, 06:47 PM   #8 (permalink)
EcoModding Lurker
 
royanddoreen's Avatar
 
Join Date: Jun 2010
Location: glovertown nl canada
Posts: 85

z - '03 nissan 350z touring
90 day: 36.21 mpg (US)

Diniro - '18 Kia Niro Ex
90 day: 47.99 mpg (US)
Thanks: 34
Thanked 6 Times in 4 Posts
I have a scanguage and I have speed ajusted properly. I calculated from my gear ratios which shows 2070 rpm at 60 mph.
  Reply With Quote
Old 01-20-2013, 07:16 PM   #9 (permalink)
Wanting more for less
 
D.O.G.'s Avatar
 
Join Date: Jan 2011
Location: New South Wales, Australia
Posts: 293

Metric - '94 Honda Magna 250
Motorcycle
90 day: 71.83 mpg (US)

RedCelica - '94 Toyota Celica ZR
90 day: 35.97 mpg (US)

i30 - '12 Hyundai i30 Elite
90 day: 38.67 mpg (US)
Thanks: 19
Thanked 68 Times in 41 Posts
Quote:
Originally Posted by GRU View Post
The stock odometer may not be accurate...do a gps distance run and see what your odometer shows compaired to gps distance....gps speed to speedometer is not the same as distance
Absolutely correct.

My car had 50 series tyres when bought ( 55 series is standard).
When checked against my GPS over my 52 kilometer commute, the odometer was correct and the speedo fast.
After changing to 60 series tyres, my odometer is 5.7% slow and the speedo about 1% slow.

When calculating my fuel consumption I now multiply the odometer reading by 1.057.

As it happens, I've gained about 5% FE, probably due as much to the Kumho KU25 to Pirelli P6 change as to the size change.
__________________



  Reply With Quote
Old 01-20-2013, 10:11 PM   #10 (permalink)
Master EcoModder
 
mcrews's Avatar
 
Join Date: Oct 2009
Location: Texas
Posts: 3,523

The Q Sold - '02 Infiniti Q45 Sport
90 day: 23.08 mpg (US)

blackie - '14 nissan altima sv
Thanks: 2,203
Thanked 658 Times in 474 Posts
Quote:
Originally Posted by royanddoreen View Post
I went from 26.7" o.d. Potenza re040 soft perfomance tires to 28" bridgestone blizzacks. The rr seems to be improved to my surprise and the lower final drive a bonus. The blizzacks are a lighter wheel tire package and my mileage has been improved greatly!!


Imagine that!!!!
Lowering the final rpm at cruise REALLY does work!

__________________
MetroMPG: "Get the MPG gauge - it turns driving into a fuel & money saving game."

ECO MODS PERFORMED:
First: ScangaugeII
http://ecomodder.com/forum/showthrea...eii-23306.html

Second: Grille Block
http://ecomodder.com/forum/showthrea...e-10912-2.html

Third: Full underbelly pan
http://ecomodder.com/forum/showthrea...q45-11402.html

Fourth: rear skirts and 30.4mpg on trip!
http://ecomodder.com/forum/showthrea...tml#post247938
  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com