On 07/20/2017 12:14 PM, Mad Roger wrote:
That could be the case that the EPA cares about something else (and they
can be driven by politics) - but - they must be subject to the scrutiny of
scientists at the car companies - so - we can assume they're held to a
higher standard than the mom and pop is who claims mpg figures with decimal
places.

Since MPG measurement accuracy & repeatability is a slightly different
subject from tire performance, we can take this subject over to this
thread:

If mom and pop are not taking advantage of readily available data from
the on-board computer systems they are either driving a 1972 Old Cutlass
or they are not part of the conversation. This is 2017, not 1917 when
you measured the tank level with a stick.