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When you say "quickly reset" the trip meter are you talking 2 seconds or within a minute? Also, are you trying to reset the trip meter while moving or is it a rally that has checkpoints where the car is stopped for a short period of time?
The SGII would keep computing the average speed while you are stopped as it is taking all activity into account from the time the car is started until the ignition is shut off.
The SGII updates with about a 1-2 second lag (as I see my real time mpg update about a second or two after I release or press my gas pedal...its pretty quick just not exactly real-time mpg and avg. speed).
Your best bet would be to either find a friend that has a SGII and try it in your car or purchase one to test it before the rally (you can send it back if it doesn't work out for you).
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