What specific wattage zones should cyclists aim to maintain while drafting to maximize energy conservation, and how can power meters help identify optimal drafting positions behind different types of riders or vehicles? For example, is it more efficient to sit behind a larger rider producing a higher wattage output, or should you aim to draft behind a smaller rider producing a lower wattage output? Additionally, how can riders use wattage data to adjust their drafting technique in various wind conditions, such as headwinds or crosswinds, to minimize energy expenditure? Are there any specific power-to-weight ratios or other performance metrics that can help riders determine their optimal drafting strategy? By better understanding the relationship between wattage and drafting, can riders develop more effective strategies for conserving energy and improving their overall performance in group rides or races?