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Thermostats will fail in the open position. Find out what the OE thermostat temp range was and use a good quality or OE thermostat (no chinese crap). Probably a 195 degree stat. At highway speeds you should see operating temps above the thermostat opening temp. I would avoid a higher than original thermostat opening temp, which could contribute to a head gasket failure.
If you replace the thermostat, test for mileage before you do any other repairs, unless you know there are other maintenance issues, especially with no CEL.
Also consider a warm air intake to bring up the incoming air temperature for better atomization, also a grille. or radiator block if not already done. Cold coolant leaving the radiator and entering the engine will kill fuel mileage.
regards
Mech
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