Turning Stone Free Slot Play

Whenever a tech is doing something to the configuration of a slot machine, I like to watch, hoping to catch a glimpse of important data regarding payout percentages, especially at casinos that aren't required to maintain a minimum payout percentage by the state.
Last night I caught a tech messing around with an Everi machine at Turning Stone. I happened to see two numbers. One for money in, and other for money won. I am assuming by the somewhat small numbers they represent values since the last reset or whatever.
Money In: $3900 and something.
Money Won: $2600 and something.
In other words, about 66% payout since the last reset (again, or whatever).
I know that the actual percentage could be set either higher or lower than that, and the numbers are only short term numbers. But given the general perception I've noticed in forums, that Turning Stone is generally bad with payouts, I wonder if these numbers give us any insight.
Don't most machines have a bottom limit below which their payout percentages cannot be set? 66% seems really low.
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