The Speed setting also affects the MPG; which is actually the odometer. There are three ways to calibrate this: measure a route in Google Maps and drive it with Trip B in your car set to measure the distance, and adjust the distance accordingly. You can use a GPS unit, if you have one, or you can drive on a highway that has measured miles (and 1/10ths) and reset the Trip B just as you pass a mile marker, and then drive far enough to get an accurate estimate of the odometer accuracy.
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