I was disappointed in this app, so much so that Im writing my first ever app review.
The online McMillan pace calculator gives you a lot more options for entering the distance you want to base your race estimates on, in addition it provides not only total estimated race time, but also pacing in km and miles.
This is a pretty basic app for the $2.99 theyre charging for it.
Mo-tage about McRun, v1.4.1