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  1. BMW Z Series - Tech Talk Z1, Z3, Z4, Z8, Z9
    I like to drive my Z4 roadster with top down. This way has better looks! However, I am wondering how much the fuel consumption will increase if I drive Z4 with top down, but with A/C turned off? Normally I drive around or less than 40mph in town with top down, not on the motorways.
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