Speed Efficiency for Speeds Greater Than 70 mph

I'm a relatively new Teslafi User.  I have taken several road trips that included long stretches with speeds > 70 mph (actually all around 72 mph).  I can see these speeds are being picked up in the drive details, but when I select speed efficiency chart  I don't see any information for speeds > 70 mph.  Is this a setup problem on my part or is this data not available in the Speed Efficiency chart?  Thanks.