Is an objective (empirical) measurement of rolling resistance available? All I know is the column in Consumer Reports assigning one of five icons, ranging from all-black to all-red.
CR rated the Michelin MXV4 Plus Energy all-red (best), along with one Continental tire, and they recommended the MXV4+ for long tread life. Our new Prius was fitted with Goodyear Integrity OEM tires, not tested.
Any recommendations for a low rolling-resistance tire besides the MXV4+? I guess there's nothing wrong with the Goodyear Integrity, but it gets a much lower rating on Tirerack.com.
CR's top-rated tire in the Nov 2007 test was the Dunlap SP Sport 5000, only $85, but apparently not available in the correct 185/65-15 size for the non-Touring Prius.