distance is great, but if the goals weight loss, worry about getting your intensity and heart rate up. I see lots of people running for an hour + at a glorified walks pace when they could burn more calories in 20 minutes if they raised the intensity.
good luck with the 6.1!!
AGREEEEEEEEEEEEEEEEED
i was a personal trainer for 4 years, HIIT is much better than distance
go grab some weights do some light weight high reps, go run on the treadmill do some HIIT 3 times a week, do abs, do circuit training... jogging 6 miles wont do as much as sprinting for 20 minutes doing HIIT and working out, supersets, dropsets, circuit training, pullups, pushups, squats, deads, burn fat more than any distance you run...goodluck