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Do these grandparents still start it 5 minutes ahead of taking a 2 mile trip to "let it warm up?" Something they probably got used to doing in their early carb days. Also the driving like a grandma, doesn't always turn out to be the best for economy. Taking 40 secs to accelerate slowly to 60 MPH doesn't get you into the most efficient acceleration. Hanging 8 seconds back from the car ahead doesn't give you any benefit of a draft. etc. etc.
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