That is amazing! I am very much a numbers and spreadsheet person so I'm definitely going to use this. I totally get that it really depends on the specific pacer you end up getting and what their walk speed is. My current walk speed is 20:00 but really only because that's what the Galloway app uses. I'll have to play around with other walk speeds. The races is still 10 months out and I know my speeds and ratios will likely change a fair bit over time but it's so hard for me to not get caught up in the numbers! Thanks again for all of your input, much appreciated!!!