Yeah the gauge actually says that. Speedometer must be @ 0 mph to begin. Thanks for the answers.

what if you have different size tires that you havent acounted for. what if you aint got any tread left on your tires and there smaller than normal. and i dont have first hand experinse but i was guessing it was like the G-FORCE things that go on movement but you can be rolling real slow before it will start sometimes. in essence, pretty acurate but there is always a few factors that could be off

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white 04 comg G gtp. wizair and pacesetters
personal best 14.6 91mph 2.1 60"
track day in a few weeks

Like I said, it's as accurate as it can be using your car's sensors.

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2004 Impala LS - got some mods
NAIOA Moderator

Making you think twice before picking on Impalas