Nice work! If you were able to run a 1:25 off riding around 81% I think that 7:30ish pace is doable. However, I'd seriously recommend going out a bit more conservative though, and if your bike was paced correctly, it will feel too easy. If you can run 7:40-7:45 pace for the first 18-20 miles and still feel great, then hammer it at the end. A good IM run is easy to talk about, but very hard to execute.

My run fitness is around yours (1:20 open half), and I have yet to have a well executed IM run.

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