View Single Post
Old 10-27-2008, 08:39 AM   #7 (permalink)
tasdrouille
Master EcoModder
 
tasdrouille's Avatar
 
Join Date: Jan 2008
Location: Mirabel, QC
Posts: 1,672

The Guzzler - '08 Hyundai Elantra GL
90 day: 33.12 mpg (US)

Got Soul? - '11 Kia Soul 2U
Thanks: 35
Thanked 83 Times in 55 Posts
Quote:
Originally Posted by groar View Post
In MetroMPG's experiment, 44 psi rated tires are used and they get their better score at 50 psi.

Of course different brands, different results.

Denis.
That result could be well within the margin of error for the kind of testing that was done.

We know that rolling resistance as a function of inflation pressure varies more or less linearly. A tire with more inflation pressure will always have less, or at worst the same, rolling resistance the same tire with less inflation pressure.

How much it impacts FE depends on the vehicule, mainly what portion rolling resistance represents compared to other sources of drag, but you can safely assume that more pressure will result in the same of better fuel economy.
__________________



www.HyperKilometreur.com - Quand chaque goutte compte...
  Reply With Quote