The Cadillac CT5-V Blackwing will get all the eye, what with its supercharged engine and six-speed handbook. However slotted neatly between the bottom CT5 and the full-bore Blackwing is the CT5-V—a strong but oft-forgotten efficiency automobile. The CT5-V packs a still-powerful twin-turbocharged 3.0-liter V-6, Magnetic Trip Management, and thanks to some updates for 2025, a …