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Mine ran about 140 without thermostat, put in a 160 thermostat, got 2.5 mpg more with just that change, it is one of the old style thermostats with a big flap and a bi-metal coil, so far 25+ years with no problems, at the time I was changing the hose and had just found the tstat in the trash
If you read the back of a motormeter it says ---"cold motor use radiator cover "in the area under about 160