Apple Watch 6 does not measure distance accurately
I received my new Apple Watch 6 yesterday, first time I've ever had one. I used the Workout app on a run this morning, for a distance I know to be exactly 4 miles. It's a 2 mile loop I ran twice, I've measured it with my car and MapMyRun. As you can see in the attached screenshot, the watch measured it at only 3.48 miles. Any ideas on how to fix this? Pretty disappointed for a $500 device to be that inaccurate.
Apple Watch