Share of Xpeng Inc. rallied 4.8% in premarket trading Monday, after the China-based electric vehicle maker reported July deliveries that more than tripled from a year ago and rose 22% from the previous month, to mark a second-straight monthly record. Fellow China-based EV maker Nio Inc.’s stock slipped 0.2% ahead of the open, after July deliveries more than doubled from a year ago but slipped 1.9% from June. XPeng said late Sunday that it delivered 8,040 EVs in July, up 228% from a year ago and