Many technologies have been identified as important to achieving GHG reduction in 2020 and 2050. Insufficient information is available that explores the likely range of GHG reduction that can result in various commercial vehicle fleets. It is also essential to understand the potential cost/payback for these technologies in order to understand the likelihood of commercialization. Provide an assessment of GHG reduction by vehicle class, ranging from Class 2 up to Class 8 vehicles. Provide projected costs associated with these technology implementations.