Onyx Black 2025 GMC Sierra 2500HD AT4 Duramax 6.6L V8 Turbodiesel 4WD 10-Speed Automatic, 4WD, Jet Black Leather. Priced below KBB Fair Purchase Price! Here at Fort Myers Mitsubishi our vehicles are reconditioned to the highest standard, regardless of which vehicle you are purchasing from us. We go above and beyond Safety Standards to ensure our clients highest satisfaction with our vehicles result. Whether it's our reconditioning process on the vehicle's exterior, or under the hood, every vehicle is handled with pride and care.