I'd credit a solid 2-3 mpg, to the project. IMHO the gain was from about 48.x to 53.x =5 mpg but I picked up about 2 mpg when car pooling dropped off to about once a week instead of daily. So that gives about 3 mpg for the heater project. My bet guess, that's all.
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Coast long and prosper.
Driving '00 Honda Insight, acquired Feb 2016.
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