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I use a 203 degree thermostat, and Evans propylene/ethylene glycol coolant.
I gained 0.5 MPG by doing this. One of the few engine mods I've seen work.
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2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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