what i've found, on getting the most accurate reading:
1. make sure the car is level (not just front to back, but side to side as well)
2. check after it's had a few minutes to start to cool off.
keep in mind that the short countdown timer is a "quick" reading. after filling the gas tank, it'll take a "longer" reading. i've seen the time get up to 5 minutes.
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"Speed has never killed anyone, suddenly becoming stationary... that's what gets you."
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