Autumn Express 2016 will count toward the Mileage Tally. Just enter your date of travel (10/29 or 10/30), Train 805, and your start and end stations (NYP or NWK). Your mileage will be recorded.
My calculation of the mileage is:
New York - 0
Newark - 10
Harrisburg - 184
Lancaster - 222
Newark - 368
New York - 378
Amtrak's on board handout typically shows the mileage. If that happens again this year, I'll defer to the official numbers.