Jamieson Hatt posted the route:

41 km point to point. Port Stanley along Kettle Creek to St Thomas along Dodd Creek to Southdel Drive. Mostly single track with some county roads connecting. Southdel Drive is also the start of the Thames Valley Trail. 

http://www.ontariotrails.on.ca/trails/view/elgin-hiking-trail

Here is our original route description:  The East Coast Trail is made up of numerous paths that intersect many communities along the coast of Newfoundland & Labrador.  It's not completely clear how long the trail is on the ground - like many trails it is in a state of flux with plans to add additional segments.  Wikipedia says 300 km, but according to Gary Robbins:  "I know they list it as closer to 300k, but they always have and that additional mileage south of the his

The route was reported to us by Jakub Sliacan: