Thanks for everyone's reply, input, experience and analytics. I'm a simple guy so put it in 6th grade math for me- Should I be concerned, or should I just ignore, my current 100% charge range of 304 miles, that used to show 310 miles every time I charged to "100%," for the past 12 months? I use my Model 3 for work commute, have only taken one long road trip to SoCal (and took the battery charge down to 7% before recharging to 90%, due to Tesla recharging locations), reside in the Bay Area so temps are very mild throughout the year.
I'm so sorry for the very poor sentence structure and multiple misplaced modifiers...