GMC debuted its all-electric 2024 GMC Sierra Denali EV today with a claimed 400 miles of range, 754 horsepower, 787 pound-feet of torque, and 800V DC fast charging at up to 350 kilowatts. Starting at an MSRP of $107,000, the all-new Sierra EV Denali Edition 1 will be available for pre-order at 5:00 pm EDT…