I really only use my logs as a benchmark from tune to the next. That could be 0-60, or in my case I look at 60-90 and 60-100. From what I have read using time slips from the track are the best way to calculate 0-60. I don't know much about the device you have but I would love to see the results and maybe a link to more info about it. If its using radar its likely quite accurate.
Scott