This will no doubt do wonders for the FE of any vehicle it is installed in. This would even be true in warm weather. I remember one day I drove home from work, looked at the SG and saw that my mileage was about 4 mpg higher than what it usually is. I sat there scratching my head for a minute, and then it dawned on me: I had been driving the car at work, so it was already warmed up when I left. A warm engine is much more efficient. I would do cartwheels if I was able to plug my car in at night.
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