Just installed my F1 MD80 that I had from FS9, Went to Flight Aware and got AAY 482 KLAS to KGRR, FA showed actual miles as 1641, I did same flight in FS flight planner and got 1466, 175 less is FS planner that bad and if so is there another planner as easy to use that's more accurate? I like to track my miles flown, just me.

FS uses nautical miles.

Thank you makes sense