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05 Mar 2009 05:03:05

Cut vehicle fuel consumption in half, urge agencies

Cut vehicle fuel consumption in half, urge agencies
Vehicles' fuel consumption should be cut in half by 2050 to combat climate change according to a group of agencies.

The Global Fuel Economy Initiative's (GFEI) '50 by 50' report claims that cutting vehicle fuel use in half would save two gigatonnes of CO2, the equivalent of half the EU's annual emissions.

It claims that the number of cars worldwide is set to triple by 2050 and improving fuel economy is essential to combating climate change.

The global economy could also be assisted by the initiative, according to the group, which is made up of the UN Environment Programme, the International Energy Agency (IEA), the International Transport Forum and the FIA Foundation.

Nobuo Tanaka, executive director of the IEA, said: "We have to find ways to reconcile legitimate aspirations for mobility, an ambitious reduction in CO2 from cars worldwide, and global economic recovery.

"In confronting the economic recession this is a real opportunity for governments to combine support for the auto industry with measures to achieve environmental and energy policy goals."

The report from the Committee on Climate Change also stressed the importance of making the transition to cleaner, lower emitting cars if climate change targets are to be met.



Discussion Thread  

07 Mar 2009

Many people could halve their transport fuel bills tomorrow if they "took-onboard" one or two facts.
For instance:
Allthough diesel engines CAN be more fuel-efficient than their petrol counterpart, how efficient they actually are depends greatly upon how they are used/misused. That is to say, that the diesel is relatively efficient only when supplying "light" torque. A fraction of what it is capable of, that is.
If we "overdo" this, of course, efficiency drops again because friction starts to become a significant fraction of the "light" torque produced by the engine. Using more than 1/4 "welly"/"throttle"/"accelerator" only in occasional circumstances, will double MPG over "putting the foot in the tank" on every occasion - particularly in a high gear.
Petrol engines are exactly opposite. Their thermo-dynamic cyle is different to diesel, since the heat is added to a constant a Volume (at the top of the piston's stroke) whereas diesel is injected as the piston moves down, which makes the the Pressure more like "constant". When the fuel-injection stops, heat is converted to Work for the remainder of the stroke. And so the sooner the injection is cut-off, the more of the heat from the fuel will be made use of.
To return to the Petrol engine, here there is a waste of energy at LOW throttle setting, because the pressure in the cylinder/manifold goes way below atmosheric, which of course means the piston must be pulled-down against this pressure differential. The situation has been described, many years ago, as the "Volumetric efficiency", I believe. The Petrol-engine, then, is most efficient with large throttle settings, high % of maximum torque.
Apart from this, it is as well to realise that fuel is used to push the car along against both gradient
and friction from air and road, and putting-on the brakes adds to this. More fuel-efficient to be going at a sane speed for the prevailing road !

Discussion Thread  


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