So here is what happens with the Aeroforce Interceptor (subject to correction if someone knows different):

0-30 mph = if you spin the tires up to 30 mph it will be optimistic since it thinks you are going that fast when in fact the tires are but you are "not"

0-60 mph = accurate

1/8 and 1/4 mile ET = optimistic since it measures tire rotations, so again wheelspin is distance not actually covered.

1/8 and 1/4 mph speeds PESSIMISTIC. In other words it will read slower than your actual speeds since it will give your speed based on distance it thinks you covered based on wheel rotations.

If you make a run without significant wheelspin, it will be very accurate if the loaded tire radius parameters are correct.