International Energy Agency
http://www.iea.org/publications/fueleconomy_2012_final_web.pdf
[From a Climate Wire article by Julia Pyper, sub. req'd] …with the right mix of policies, conventional vehicles can cut fuel consumption in half in the next 20 years. According to IEA’s “Technology Roadmap,” internal combustion engines can be significantly improved using cost-effective technologies, such as variable valve actuation and lift, dual-clutch transmission and downsizing. Hybridizing the drive train can cut a vehicle’s fuel use by as much as a quarter but comes at a higher cost…
