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Old 03-30-2009, 01:21 PM   #26 (permalink)
Deezler
Master EcoModder
 
Join Date: Apr 2008
Location: Michigan
Posts: 261

Bio Deezler (sold) - '03 Volkswagen Jetta GLS TDI
90 day: 50.78 mpg (US)

The Beast. - '03 GMC Sierra 2500HD SLT
90 day: 12.86 mpg (US)
Thanks: 0
Thanked 36 Times in 22 Posts
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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