I've had a few questions about whether this is STV rather than just IRV.
In Minneapolis, it really is STV, at least in part -
"While this voting method is commonly referred to as Instant Runoff
Voting for single seat elections, the actual method of counting is
“Single Transferable Vote” (STV) and can be applied to both single seat
elections (i.e., Mayor, City Council, and Park Board Districts) and
multi-seat elections (i.e., Park Board at Large, Library Board, and the
Board of Estimate and Taxation)."
The next task will be to get the council and park board elections
shifted to STV, but there will be a precedent in these other elections.
http://www.betterballotcampaign.org/BBC/irv
Cheers,
Antony