Jordan Taylor was fastest in the final practice session of the 'Roar before the Rolex 24' pre-Daytona 24 Hours test.
Taylor put the #10 Wayne Taylor Racing Cadillac DPi to the top of the timesheets with 10 minutes remaining with a time of 1m36.757s.
This relegated long-time leader Mike Conway's #31 Action Express Cadillac to second place by 0.357 seconds.
Pato O'Ward had briefly held second in the #38 Performance Tech Motorsports ORECA before Antonio Felix da Costa took that place from him shortly before the halfway mark in the Jota-run #78 Jackie Chan DC Racing ORECA.
Da Costa ended up third ahead of O'Ward after Taylor jumped them when he went fastest.
Olivier Pla had been quickest very early in the session in the #2 Extreme Speed Motorsports Nissan DPi, but was eventually shuffled down to fifth with a time 0.768s off the pace ahead of the second Jota ORECA of Williams Formula 1 driver Lance Stroll.
Simon Pagenaud was the best of the Penske Acuras in seventh place, ahead of Christian Fittipaldi's #5 Action Express Cadillac.
Fernando Alonso did not participate in the session, but team-mate Lando Norris set the 10th-fastest time in the #23 United Autosports Ligier before handing over to Phil Hanson.
This was after Nicolas Lapierre made a late improvement to take ninth in the second ESM Nissan.
Laurens Vanthoor set the pace in GTLM in the factory Porsche with a best time of 1m44.550s set early on, with team-mate Nick Tandy slotting into second with 15 minutes remaining.
In GTD, Ezequiel Perez Companc was fastest in the #19 Grasser Lamborghini Huracan, two hundredths faster than AJ Allmendinger's #86 Michael Shank Racing Acura NSX.
The fastest time set overall during the three days was by #31 Action Express Cadillac driver Felipe Nasr in Sunday's so-called qualifying session, which sets the pitbox and garage order.
His time of 1m35.806s was 0.231s faster than Tristan Vautier managed in the #90 Spirit of Daytona Cadillac as the marque's four cars proved the quickest at Daytona.
Joey Hand's 1m44.610s lap set during the qualifying session in the #66 Chip Ganassi Racing Ford GT was the quickest in GTLM.
In GTD, Rolf Ineichen's 1m47.104s set in the first session on Friday in the Grasser Racing Lamborghini Huracan was never bettered.