Nissan e.dams ABB FIA Formula E driver Oliver Rowland set the fastest Saturday practice time ahead of the opening New York E-Prix race.
Rowland completed his best lap in 1m09.695s after the checkered flag had flown to depose BMW Andretti's Antonio Felix da Costa from the top spot.
That late lap prevented BMW completing a clean sweep of Saturday practice sessions after da Costa's team-mate Alexander Sims had topped the earlier running courtesy of a 1m09.959s effort.
Rowland's team-mate Sebastien Buemi set a late time to go third in the second session ahead of Sims and Robin Frijns, the Envision Virgin Racing driver setting his best lap in the final moments of the running.
Frijns's best lap put him ahead of fellow late-improver Pascal Wehrlein, who placed sixth for Mahindra Racing ahead of Virgin's Sam Bird.
Wehrlein's team-mate Jerome d'Ambrosio was eighth with Felipe Massa (Venturi) and Mitch Evans (Jaguar) in 10th.
The two main title contenders in championship leader Jean-Eric Vergne and Audi's Lucas di Grassi finished the second practice session in 16th and 17th respectively.
Vergne had been fourth in the first session, while di Grassi was just 12th.
The DS Techeetah driver heads into Saturday's qualifying session with a 32-point buffer over Di Grassi.
The practice running went largely without incident, although drivers such as Vergne and HWA's Stoffel Vandoorne brushed the wall on full-power laps.
Vergne also overshot the Turn 11 right-hander under braking but continued without incident, while the slow left-handed Turn 6 approach caught several other drivers out during practice.