[arcosine]

I modded the thermostat today. Engine temps were 145 to 155 with a 185F thermostat, standard Saturn s-series. I ground the pin down, now the engine temps are 185-190. Thats 40 degrees warmer, so it probably opens at 225F or so. The temperature gauge was at the first line, 1/4 now it's between 1/4 and 1/2. More heat too. Averaging 51 mpg so far this tank, not bad for December weather. I don't know how engine temperature equates to mpg, on the absolute scale its 604 Rankine or 7% hotter, so maybe I''ll see a 3% increase due to volumetric deficiency.

Air inlet temperature is 150F after 15 miles freeway warm up, about 115F above ambient.