Proposition 131 would apply to elections involving state and congressional races, not local races like county commission or presidential races. CBS Colorado Political Reporter Shaun Boyd gave the proposition a Reality Check. You can see the sources for Boyd's report below:
https://voterrightsco.org/
https://yeson131.com/
https://www.rcvresources.org/where-is-rcv-used/
https://fairvote.org/our-reforms/ranked-choice-voting-information/#jurisdictions-using-rcv
https://electionlab.mit.edu/research/instant-runoff-voting
https://www.representwomen.org/2020_rcv_report
https://drive.google.com/file/d/1uyenBJYRRLTsNIptu1Uqm8_8J9jFDlK4/view
https://political-innovation.org/wp-content/uploads/2023/09/FFV-Report-10.22.2021.pdf
https://www.cogitatiopress.com/politicsandgovernance/article/view/3938
https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3697637
https://fairvote.org/maine_voter_survey_shows_rcv_was_easy_to_use/