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Another one to point out is a heater pad on the oil pan. I did this recently and noticed even further improvements in MPG on my short drives, as well as better idle.
I plug my car in every night and have a timer setup to warm up my car for about an hour or so before I leave. Anything more than this doesn't give much benefit in heat. (though, I should do another graphing session on these temps for VS ambient temp, that would be interesting...)
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