Based on 20,198 Dania trifectas over three years, you would have
made the most money playing 6-5-8 every time. It hit 24 times
over three years for big payouts.
Only seven tri's made money using the median payout in the expected
value calculation (i.e., EV = prob of the tri X estimated payout);
only 22 made money using the mean payout in the calculation.
This assumes that your betting 6-5-8 wouldn't have significantly
reduced the payout (a bad assumption.)
Of course, the most frequent tri was 2-4-1, but you would have
lost money playing it.
-- S.t.