COCyclist,
I'll probably do pretty much the same thing. Only run the heater until the morning ambient temps get to about 45 or 50 degrees F. Since I bought a 220V heater (for some reason), I only get my coolant temps up to about 90 F, but thats still nice for a smooth startup.
The OMI install required a few more parts since I am upgrading the entire airbox and mass airflow sensor housing also. I think I have everything I need ordered now, so hopefully I'll get to it soon.
First tank re-fill after the heater and thermostat: 48 mpg. 1.5 better than the last tank. I think that's outside of my mileage measurement error, so I'm pleased.
Hopefully the warmer weather and my continually refining driving style aren't clouding the results too much..
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