That could have been the case if the wind had been against me not with me like I thought. I'm not sure, it seemed normal on the speed display and I watched it slow all the way down to 0mph horizontal. I'd been getting steady 61-62mph just before that nearer the ground with no wind.
I'm having problems finding a good size place to fly but when I next get a chance to use sport mode I'll let you know what I get.
I had the controller displaying 86mph horizontal on Sunday (Sport mode). I was at 400 feet so Inspire probably caught a gust of wind. No wind at ground level.