I live 30mi NE of Atlanta, so my daily grind is a mix of roads types and traffic patterns. My mileage goes up about 1.5/2mpg when it cools off and I don't run the AC. That compressor really eats HP when it runs. I must admit that I haven't run any tests in cold weather to determine HP difference compared to summer. I do know that all around performance is better when the ambient air is cooler and the AC is off. I will run a series of tests this Fall/Winter to have actual numbers.
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