Chevy Silverado, GMC Sierra Keep Fuel-Saving Feature

The 2027 Chevy Silverado 1500 and 2027 GMC Sierra 1500 bring new naturally aspirated Gen 6 V8 engines—yet both keep General Motors’ Dynamic Fuel Management (DFM) cylinder-deactivation system. The DFM, a successor to GM’s Active Fuel Management, shuts down cylinders based on load, using fewer cylinders during steady cruising and more under heavier demand, with 17 cylinder patterns in total. The approach has long drawn criticism from enthusiasts due to added mechanical and electronic complexity and concerns tied to long-term reliability, particularly lifters. Despite higher outputs—402 hp and 428 lb-ft for the 5.7L V8 L76 and 481 hp and 501 lb-ft for the 6.6L V8 L78—some buyers may be disappointed that DFM remains. The article also notes the 6.2L V8 L87 is under an ongoing recall.