Scott runs 3 x 2 = <<3*2=6>>6 miles every Thursday and Friday.
The total miles run by Scott for a week from Monday through Wednesday is 3 x 3 = <<3*3=9>>9 miles.
The total miles run by Scott for a week from Thursday to Friday is 6 x 2 = <<6*2=12>>12 miles.
So, in a week, Scott runs a total of 9 + 12 = <<9+12=21>>21 miles.
Thus, he runs a total of 21 x 4 = <<21*4=84>>84 miles in a month.
#### 84