2014 GMC Sierra Denali 1500 4WD Crew Cab Review – Verdict The 2014 GMC Sierra Denali 1500 4×4 with the 5.3L flex-fuel V8 engine produces 355 horsepower and 383 lb-ft of torque, features an automatic transmission, and achieves an estimated 16/22 MPG (city/highway) on gasoline. Key features include Flex Fuel capability, an aluminum block engine, Active Fuel Management, and Variable Valve Timing, along with Denali-specific luxury and convenience features like a unique grille, 20-inch wheels, and a soft-opening tailgate. Engine & Performance Engine: 5.3L EcoTec3 V8 with Flex Fuel capability, Direct Injection, and Variable Valve Timing. Horsepower: 355 hp @ 5,600 RPM. Torque: 383 lb-ft @ 4,100 RPM. Drivetrain: 4×4 (Four-wheel drive). Transmission: Automatic. Fuel & Economy Fuel Type: Flexible Fuel (can run on unleaded gasoline or up to E85 ethanol). Fuel Economy (Gasoline): City: 16 MPG. Highway: 22 MPG. Combined: 18 MPG. Key Features & Technologies Engine Technology: Active Fuel Management (deactivates some cylinders under light load to save fuel). Direct Injection (delivers fuel directly into the combustion chamber for better efficiency). Variable Valve Timing (optimizes engine performance across different RPMs). Flex Fuel System: Allows the engine to operate on gasoline or a blend of gasoline and ethanol, such as E85. Denali Features: Unique, bold grille and exterior styling. Standard 20-inch wheels Soft-opening and soft-closing tailgate. Backup camera focused on the trailer hitch. Bose premium audio system. Heated and cooled seats. Power-adjustable pedals. Dual-zone climate control. WEATHER TECH CARPETS TONNEAU COVER K&N AIR FILTER FACTORY NEW TRANSMISSION