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@BringMeMyFix
If the runner's going to be averaging 20mph (11s), then I'd be looking at a gear in the low to mid 60s. Easy enough to get on top of it within 4 or 5 seconds, and you could sustain close to 30mph for the last 40m or so. Or thereabouts.
Work on your standing starts. That's the most important bit, and it may take a few sessions for your lower back to acclimatise.