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You suffered for that number, which is exactly why you trust it. That is the problem. The multiplier everyone uses is the same for every athlete, and every athlete is not the same. Riders with a big anaerobic engine overestimate every single time. This is not an argument for abandoning data. It is an argument for pegging it to something true. Once you have done it, you have the information for life. 18 lessons, a 12-page workbook, $47, one payment.