Between 132-138 KIAS, and we can do RWY 4 in LGA and make the turn off before RWY 13/31. It'd be less with a full 319. You're looking at a max landing weight of 142.2 for a 320 and 134.4 for a 319.

Also, you may see a higher speed if there is a strong headwind on the approach because the Groundspeed Mini function will add the headwind component to the final approach speed to keep your GS the same as your calculated approach speed. It slowly backs it off to approach speed as your get closer to the ground.