68.9 in ATTI mode w/15-20 MPH tail wind @ 400ft. It sustained this for nearly 2 miles. The trip back was ~15mph. Make sure you have enough battery! When returning to home, just lower your altitude 100-150ft for a speed increase!
Would you mind sharing your .txt flight log of this flight?
Also which firmware were you using?
And, was this flight with a P3?