Let us say you did not track dead miles such as myself. there is a way around it but it is incredibly tedious. Basically if you just finished a trip, you would just calculate the miles it takes to go from the end of your most previous trip to the pick up of your next trip. I know this seems.obvious but I read some people are nervous about this. It will take Forever to calculate, but it must be done. So far my ratio of true miles to dead miles is about 40 percent to 60 percent.... dead miles suck.