I think Kurt's done around 67,500 with 40 days to go (325 days x 75,065 miles / 365 day + 690 miles based on Jo's latest report and reflecting Kurt started 10 days after Steve). So would need to ride around 237.5 miles a day to end with 77,001 miles ( 77,001 - 67,500 / 40).
He's got 30 days or so until the end of calendar year 2015, and so needs to ride around 250 miles a day to reach the calendar year mark set by Tommy.
It's personal opinion as to whether these are achievable, or relevant.