The second study was done on the “TSTC commute cycle” which is mostly freeway driving and long enough
to warm up the engine early in the trip
The old logbook corresponds to similar driving: McGregor-to-Waco on un-crowded roads,
almost as far
The difference in driving cycle precludes a firm conclusion, but the data are suggestive, and
match the warm weather performance in the first study very well
