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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 04-11-2021, 09:34 PM   #1 (permalink)
Master EcoModder
 
JRMichler's Avatar
 
Join Date: Feb 2011
Location: Phillips, WI
Posts: 980

Nameless - '06 GMC Canyon
90 day: 32.06 mpg (US)
Thanks: 187
Thanked 411 Times in 263 Posts
Tire size vs MPG - EPA test results

The new different trim levels of the new Honda Accord Hybrid come with different tire sizes, and different EPA gas mileage results. The lower trim levels have 225/50 tires on 17 inch wheels, and get 48 EPA MPG. The higher trim levels have 235/40 tires on 19 inch wheels and get 44 EPA MPG.

The wider tires are 0.5" larger diameter, or 2%. The 2% diameter difference does not explain the 9% MPG difference. And 10 mm width difference should not cause enough increased air drag to cause the 9% MPG difference. I suspect that the narrower tires are LRR, and the wider tires are not.

Article: https://arstechnica.com/cars/2021/04...accord-hybrid/

__________________
The vacuum gauge plus wheel covers helped increase summer 2015 mileage to 38.5 MPG, while summer 2016 mileage was 38.6 MPG without the wheel covers. Drove 33,021 miles 2016-2018 at 35.00 MPG.
  Reply With Quote
The Following User Says Thank You to JRMichler For This Useful Post:
Joggernot (04-12-2021)
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 04-12-2021, 03:38 AM   #2 (permalink)
Master EcoModder
 
Stubby79's Avatar
 
Join Date: Sep 2012
Location: Victoria, BC
Posts: 1,715

Firefly EV - '98 Pontiac Firefly EV
90 day: 107.65 mpg (US)

Little Boy Blue - '05 Toyota Echo
90 day: 33.35 mpg (US)

BlueZ - '19 Nissan 370Z Sport
90 day: 17.19 mpg (US)
Thanks: 72
Thanked 551 Times in 413 Posts
Article claims unsprung mass as well as larger contact patch as the reasons behind it.

You may be right, LRR would certainly make up the difference in a hurry.

Tread design, rubber compound and rubber "stickiness" might as well. Some tires are more efficient than others, even without being LRR. Would assume the sportier 19's are stickier, designed for grip and not for being quiet or long-lasting.

  Reply With Quote
The Following User Says Thank You to Stubby79 For This Useful Post:
Joggernot (04-12-2021)
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com