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Many thanks for that find. Here are some observations that i lifted from the report:
"Rolling resistance is due to hysteresis, which is a function of tire chararacteristics such as dimensions, geometry, composition, and thread depth.
The RRC of a tire decreases as the tire wears; this reduction is due in part to the reduction in thread depth.
Rolling resistance is also affected by operating conditions such as load, temperature, and inflation pressure.
The RRC of an underinflated tire is substantially higher than that of a tire that is properly inflated.
A reduction in RRC of 0.001 is expected to increase fuel economy by 1 to 2 percent. The actual increase will be closer to 1 percent for low-RRC tires and urban driving, and closer to 2 percent for high-RRC tires and highway driving."
The probability distribution curve showed the average RRC to be about 0.010 over a range from 0.007 to 0.017.
e.g. Michelin 255/65-17 LTX A/S @ 0.00745
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