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All good ideas. I believe that any gains you're making are probably negated by idling your car for five minutes every time you drive it. Yes, your mileage will suffer when the engine is cold. But your mileage while the car idles is ZERO! This is particularly true if you live in tropical area; your car will warm very quickly, lessening the cold run time. I live in a four-seasons area and the only time I start my car before driving it is if I have to scrape the windows. Otherwise, I start the car and go.
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