Just keep practicing everyday or every other day. But don't just limit your practice runs, challenge yourself.
get it tuned or get a new drive shaft
You are running 9 miles per hour.
85.7 minutes.
2.58 miles / 61 minutes * 60 minutes/hour ~= 2.538 mph
You are running at about nine (9) miles per hour.
Three and half miles per 23 minutes. ;)
11/2 miles in 15 minutes = 6 mph
Running one mile in nine minutes is running at 6.66 miles per hour.
If you run at 10 miles per hour for 25 minutes you will have covered 4.167 miles.
5.68 miles per hour.
Four miles.
6.4mph