I changed the GPS compression to 'None' and it looks like the plateaus are gone. The data also does not have any gaps anymore. Looks like that was it.

Thanks for the response. I'll change the compression settings and try again.

The speed chart does not seem to show any speeds past 100 mph and I am not sure how to allow it to. I am not sure if the data does not go up past 100 MPH as the maximum speed reported by the laptimer app is 99.7 mph. There is a visible (to the point of appearing artificial) plateau in the chart. I a...