[cnavarro]

Oil consumption would decrease with the low temperature thermostat, if nothing at all, because the oil will be cooler, thus more viscous.

This is akin to the difference between running 0w40 m1 and 15w50mi in an aircooled 911 - a change as little as that has a huge affect on oil consumption, with the thicker oil using significantly less. My 964 would use 1 qt/700 mi with 0w40 and uses 1 qt/1500-2000 mi with 15w50 m1, for example.