I'm no engineer, but something tells me that Ford selected that thermostat for a reason. I have a sneaky suspicion that fuel combustion is more complete at higher temps, but that's just a suspicion.

95 Contour Zetec, ATX (wrecked, sitting in the barn) 95 Mystique Zetec, MTX 2000 Taurus SEL 3.0L Duratec 1994 Crown Victoria LX 4.6 V8 1993 Chevy Silverado 4.3 V6