I just wanted to point out that most trails are loops but Huron trail is an out and back type of trail. The maps say it's 36 miles plus another 9 miles down the Sand Lake spur so the whole trip is 90 miles. AFAIK
you can still get gas at The Dam Store near the Foote dam on the east end of the trail. I know you aren't likely to go that far east CALL911 but wanted you to be aware of it just in case. Huron trail is also a snowmobile trail in the winter so it's nice and wide. You can probably average 30 MPH on it but only 15-20 MPH on a lot of the other trails that are maintained at 50 inches wide.