This tool works on an average expected number of successful occurrences of the Fetch chip collecting something for you during a real time hour, as calculated by assuming five in-game hours. It is calculated using a modified version of Poisson Distribution. The upgrade option which is highlighted is the recommended upgrade to take at any given stage of progress. It should always match whichever upgrade is the most efficient in terms of how many more successful finds should occur per hour as a result of taking that upgrade (whichever has the lowest cost per extra find in the table). The prices also assume that all increases remain linear, and I have not added a limit to the number of upgrades you can take. You can decrease values using the "-" buttons if you want to experiment with different configurations.