I own an Audi A4 diesel, 96 KW, and being new here I am very interested which are the best methods to increase fuel, hypermiling especially in city. I use to downhill on my trip to work in the morning, when the car is not warm. Which is the best method to coast: in gear or neutral? It is worthy to put something in fron of the radiator, even in the spring-summer time?
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