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The WLTP test cycle replaced NEDC for vehicles approved for sale in Europe after September 2018, and all published figures for vehicles on sale after January 2019 should use WLTP fuel economy figures [1] The NEDC test procedure is defined in UNECE R101 [2] for the measurement of CO 2 and fuel consumption and/or the measurement of electric ...
On a typical vehicle, every extra 55 pounds (25kg) increases fuel consumption by 1 percent. [7] Removing roof racks (and accessories) can increase fuel efficiency by up to 20 percent. [7] Reducing on-board fuel to a lower value (50% to 75%) can also benefit fuel reduction in a town traffic setting ("VW Golf 8 online help".).
The Worldwide Harmonised Light vehicles Test Procedure (WLTP) [1] is a global driving cycle standard for determining the levels of pollutants, CO 2 emission standards and fuel consumption of conventional internal combustion engine (ICE) and hybrid automobiles, as well as the all-electric range of plug-in electric vehicles.
The "Drive-cycle" basically is the representative of the road. Drive cycles are used to reduce the expense of on road tests, time of test and fatigue of the test engineer. The whole idea is to bring the road to the test lab (a chassis dynamo-meter) or to the computer simulation. Two kinds of drive cycle can be made.
Natural Resources Canada's Office of Energy Efficiency publishes annual statistics regarding the efficiency of the entire Canadian fleet. For researchers, these fuel consumption estimates are more realistic than the fuel consumption ratings of new vehicles, as they represent the real world driving conditions, including extreme weather and traffic.
Safe Road Trains for the Environment (SARTRE) is a European Commission-funded project to investigate and trial technologies and strategies for the safe platooning of road vehicles, a transportation concept in which several vehicles are electronically linked together in a "road train", with only the lead driver in active control.
More developments are in the pipeline, including a new type of jet engine, developed by Rolls Royce, called the “UltraFan”, which will reduce average fuel consumption by 10%.
The note about European driving cycles yielding higher fuel consumption levels than the U.S. cycle needs correction, and the comparison cited, for the Honda CRZ, appears to be comparing the European test results to the U.S. adjusted (for onroad) values, not the actual test results....the U.S. test results will tend to give LOWER fuel ...