Well Mike you have us beat for sure, our furthest is only 744.1km, Hike to Sturdee Cove - Stage 5 - By The Creek. A lot of our FTF's are in the Marathon area and all hidden by jleecollins. He's got a bunch right now that we hope to grab on our bi-annual trip up to northern Ontario next summer.
There's another FTF question, what's the greatest time between publishing and FTF? Ours is 3 years minus 8 days, A Little Bit of Marathon History published Aug. 2, 2004, FTF July 25th, 2007!