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View Diary: Feedback systems ... a key to a better energy future? (21 comments)

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  •  Cheapest milage gage (0+ / 0-)

    The cheapest mileage gauge around is simply to hook a vacuum gauge up to your carburetor/mass airflow sensor (there's a hose connection already there).  Some older BMW's did exactly that, then changed the numbers on the gauge.  It doesn't supply the average mpg, but it does indicate immediate fuel efficiency, very immediate.  Also depending on your make/model of car, the vacuum pressure readings can be cannily accurate to your actual mpg.

    Total cost should be less than $20 depending on where you want to stick the gauge in the car.

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