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MarkD M42 Chip installed

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    How has this chip effected your gas mileage? I drive 1 hour each way to work at a relatively slow pace, listening to my audiobook and getting 30+MPG.

    I, like everyone else loves more performance, but does it come at the expense of gas mileage even when you aren't pushing for power from the engine.

    Also, how does this chip perform in the cold weather? Does the more agressive timing lead to problems when it is -20F in the Winter?
    E36 1998 M3 Coupe - Titanium Silver (M3 Tech Procedures)
    E30 1991 318i - Red (318i Tech Procedures)

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