From a Diesel Power magazine article (prior to the bankrupcies by GM and Chrysler) on 1/2 ton diesels:
Dodge Ram 1500
Engine: 5.0L Cummins 90-degree V-8
*At least 320 hp and 500 lb-ft
*Aluminum heads and an iron block
*Exhaust gas recirculation (EGR)
*Cummins-built variable geometry turbo located in the engine valley
*Catalytic converter and
diesel particulate filter (DPF)
*Common-rail fueling with piezo injectors
*Engine weight 710 pounds
*Selective catalytic reduction (SCR) through the use of liquid urea
*Chain-driven single overhead camshafts
*Six-speed automatic 655RFE transmission
*10 1/2-inch ring gear diameter in the semi floating AAM rear axle
MPG: (Diesel Power December 2006 issue titled, "New Cummins V-6 and V-8")
A Department of Energy test found the 1/2-ton Ram delivered 24.6 mpg
Ford F-150
Engine: 4.4L 60-Degree V-8
*310 hp and 516 lb-ft
*Acceleration similar to a 5.4L gas engine
*Common-rail fueling with piezo injectors
*Twin turbo arrangement
*Catalytic converter and diesel particulate filter (DPF)
*Compacted graphite iron engine block
*Selective catalytic reduction (SCR) through the use of liquid urea
*Belt-driven camshafts
*Six-speed ZF automatic transmission
*9 3/4-inch ring gear and seven-lug wheels similar to the semi-floating rear axle of 7700 series F-250
*According to a poster secretly filmed at a closed viewing, the
diesel engine is said to have 20% better fuel mileage compared to the 5.4L gas engine.
GMC Sierra and Chevrolet Silverado 1500
Engine: 4.5L LMK Duramax 72-degree V-8
*At least 310 hp and 520 lb-ft
*Aluminum heads and compacted graphite iron engine block
*Exhaust gas recirculation (EGR)
*Compression ratio: 16:1
*Variable geometry turbo located in the engine valley
*Catalytic converter and diesel particulate filter (DPF)
*Common-rail fueling with piezo injectors
*Selective catalytic reduction (SCR) through the use of liquid urea
*Chain-driven dual overhead camshafts
*Six-speed automatic 6L90E transmission
*9 /2-inch ring gear diameter in the semi floating rear axle
MPG: According to Diesel Power's October 2008 interview with GM's Executive Director of Diesel Engineering, Charlie Freese, the 4.5L Duramax is projected to have at least 25% better fuel efficiency than a similar gas truck under light load conditions. However, under work situations, this diesel engine is said to be 40-70% more fuel efficient compared to a similar gasoline-powered truck.