[Cd]

Originally Posted by MetroMPG;146120
I can't help but wonder about the collective fuel consumption impact of hundreds of thousands (millions?) of vehicles that don't bother adding wheel covers to their snow rims.

We already know that non-smooth wheels/rims eat fuel:

[url

http://ecomodder.com/forum/showthread.php/experiment-smooth-wheel-discs-tested-b-4-6-a-4368.html[/url]

aero mods-data-% change or Cd change ( installment # 7-Wheels/Tires/Wheelcovers/etc.

I can't help but wonder about the collective fuel consumption impact of hundreds of thousands (millions?) of vehicles that have oversize pimp wheels.