MPG in my sedan

[deerebilt]

since new march 08, now 34k miles my overall average is 45.5 mpg. been low to mid 40s in winter and low to mid 50mpg is summer

[Yaris Hilton]

I think the nominal thermostat opening temperature is 184 F. They're not high precision devices, and open gradually over a range of temps, not all at once. In warmer weather it'd likely settle somewhere above the thermostat temp and fluctuate with engine load and vehicle speed.

[Kaotic Lazagna]

Originally Posted by deerebilt

since new march 08, now 34k miles my overall average is 45.5 mpg. been low to mid 40s in winter and low to mid 50mpg is summer

That's awesome. I still can't break into the 50's again. When ever I enter city driving, my AFE drops from mid to high 40's into the high 30's or low 40's. Arrrgh.