George wrote:
>> I would think that the maker's rev/mile
specification is measured according to an industry
testing procedure while holding constant the
other variables which affect the measurement, such as
speed, load, inflation pressure and temperature.

I can neither confirm nor refute this, tho I suspect
George is correct. For example, the data sheet for the
LT195/75R14/C Michelin XC LT4s which I am currently
running specifies 45 mph as a baseline for their
Revs/Mile of 824. One could reasonably speculate that
45 was perhaps selected as some sort of real-world
average betwixt city and highway driving, both of
which are far different from parked in the driveway.
As George suggests, it may even be an industry
standard

Jeffrey Earl
1983 diesel Westfalia "Vanasazi"
http://www.vanthology.com/

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