My PR in the 1600 is 4:43 as if right now, but lately I have been running the 800 and I brought it down to 2:04. I've been trying to break the 4:40 mile since last year and I haven't been able to do it. But now that I've ran a 2:04 800, sub 4:40 seems like it should be within my reach..... right? What does a 2:04 extrapolate to roughly?