I've never heard of any rating system, or specs that say what a given tire's
rolling resistance is.
I do find that www.tirerack.com is just an incredible resource for jillions
of tires and their specs.
'IF' tires are rated that way, they'd likely have something on it.

Otherwise, I'd say narrow, not wide.
Tall for higher gearing affect.
Stiff side walls, which you can deduct from the load rating and the max
pressure.
A 185 R14 C tire, comes in C load rating or D.
The D load rating ones, they're rated for 1,800 lbs each or so, at 65 max
psi. 
I would think a tire like that would have low rolling resistance for its
size.
Tire pressure is a major factor of course, higher = less rolling resistance.
Scott
www.turbovans.com 

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Mike Riley
Sent: Tuesday, April 15, 2008 4:32 PM
To: vanagon@GERRY.VANAGON.COM
Subject: tire rolling resistance

hi,
is there a chart somewhere for the vanagon tires that list rolling
resistance?
 l need to replace them and with the price of gas, I want the tires with the
best gas mileage.
mike

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