Top 10 Most Fuel-Efficient Pickups in 2023 Published on September 2, 2023 in Top 10 by Guillaume Rivard Photo: Antoine Joubert 2. Chevrolet Silverado 1500 Duramax and GMC Sierra 1500 Duramax 3L 6-cylinder diesel engine, 4x2 Combined fuel consumption: 9.2 L/100 km (4x4: 9.8 L/100 km)