I took the WS6 on its first roadtrip since the Predator/180 t-stat install. I was suprised to see it lost about 5 mpg. I though the pred-tune only affected WOT-anyway I reinstalled the factory tune at a gas stop and the next 2 tankfulls also showed lower mpg, so that leaves the t-stat??? Anyone notice a dropoff in mileage with just a lower temp? The engine was running cooler than it used to. Any thought??? thanks

 

I'm not 100% sure if a thermostat helps or hinders fuel mileage > But it is not going to cause a difference to that degree.

 

I think I've seen this before, dejavue? I tried to answer your other post hope it helps some.