Internal combustion engines, efficiency

Rudolph Christian Karl Diesel was a German thermal engineer and inventor of the high-efficiency internal-combustion engine that bears his name. 

Another problem is cost-effectiveness, hydrogen must be able to compete with alternative strategies including more fuel- efficient internal combustion engine vehicles. The Shell studies estimate that the cost in the U.S. to supply 2% of cars with hydrogen by 2020 is about 20 billion. 

The competition—more fuel-efficient internal combustion engine vehicles—is getting tougher, so the incremental benefits of using fuel cell vehicles will be smaller than if they were replacing existing vehicles. 

The incumbent technologies do not stand still, but continue to improve in performance, albeit within the envelope of the other components of the energy system—for example, more fuel-efficient internal combustion engine (ICE) vehicles and hybrid propulsion systems that make better use of the existing fueling infrastructure. 

By virtue of the composition of the exhaust gases, mass gassings with Diesel exhaust fumes cannot have taken place. Had there really been execution chambers or gas vans operating with exhaust gas, the Germans would have used the more efficient internal combustion engines, or the even more efficient wood-gas generators. 

Developing more efficient internal combustion engines or cars that do not depend so heavily on fossil fuels. 

Cars are the most popular transportation means in developed countries such as the United States and Canada, and their popularity is increasing rapidly in developing countries such as China. To some extent, cars make the routine commute more convenient and comfortable if roads are not heavily congested. In the United States, most of fhe crude oil is used by cars. What other fuel will power cars becomes an urgenf issue as the world crude oil reserve decreases with time. In addition, cars are based on low-efficiency internal combustion engines (ICEs) with gasoline as the fuel, and emit harmful NO, SO, and a lot of CO2 (a greenhouse gas, or GHG). Heavy use of cars has seriously deteriorated the air quality in many urban areas worldwide. 

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