Fuel cells are twice as efficient as combustion engines, and that is enough for Honda.
It actually began to occur long before humans invented agriculture, smoke stacks, and gasoline-fueled internal combustion engines.
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High-efficiency internal combustion engines combined with lightweight materials can dramatically increase fuel efficiency in cars and trucks.
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In SNG's case, the gas can also be compressed and used to fuel cars with internal-combustion engines.
Likewise, BMW withdrew its own test fleet of 100 cars with internal-combustion engines modified to run on hydrogen.
And fuel cells are more efficient than internal combustion engines because they do not create as much unused heat.
The clear trend at this show is toward green cars that go the extra mile with regular old internal-combustion engines.
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This is from a company that sold 21 million internal combustion engines for cars, motorcycles, lawnmowers and boats last year.
Internal combustion engines have been around for over 100 years, but they generally are only 10 to 20 percent efficient.
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Hybrids, already being sold by Honda and Toyota by the thousands, use battery-powered electric motors to assist traditional internal combustion engines.
Petroleum caught on early as the main fuel source for internal combustion engines because it was plentiful and cheap to refine.
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Technologies such as internal combustion engines and gas turbines will continue to improve gradually in efficiency but they are familiar and developed.
With the loss of inefficient internal combustion engines along with the use of heat-pumps and better insulation in the building sector etc.
Titan will be primarily used for materials research, nuclear energy research, and studies of ways to make combustion engines more efficient.
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It is also researching fuel cells as an alternative to internal-combustion engines.
The key to thermal efficiency for internal combustion engines is compression ratio.
Amazingly complex internal-combustion engines give great performance and clean air, and the new hybrids (gasoline and electric) go 21 kilometers on a liter.
Methane can be used in any application we need done, including powering internal combustion engines -it can even be used in catalytic fuel cells.
The power production process is environmentally friendly and up to 30 percent efficient while typical internal combustion engines are 25 to 40 percent efficient.
Instead, I leaned in farther in a panicked attempt to find the nearest sidewalk and escape the internal-combustion engines threatening to crush me from behind.
These devices, which work by combining hydrogen with oxygen from the air to produce electricity, are popular candidates to replace internal-combustion engines in road vehicles.
Oil is found in relatively few places, and its energy density, pumpability and ease of use in internal-combustion engines makes it particularly well suited as a transportation fuel.
Ford is developing hydrogen combustion engines along with fuel cells.
"We really and truly expect that fuel cells are going to double the fuel efficiency of the best internal combustion engines and in some cases triple it, " Roan said.
And we are currently developing a wide range of advanced technology vehicles, including more hybrids, more diesel engines, hydrogen internal combustion engines and even fuel cells later on down the road.
Early internal combustion engines (get out and crank, anyone)?
If cars with combustion engines are banned from city centres, as proposed by the European Union this week and discussed by authorities across the world, the number of interested buyers might well swell.
But if, as many predict, the shift from cars with conventional combustion engines to electric cars is set to remain slow for years yet, there is another, less visible, electric motoring revolution taking place.
The strong showing of conventional vehicles in the top twelve is a testament to how serious manufacturers have gotten about recasting these vehicles as fuel-sippers with transmission refinements, weight savings, and sophisticated internal combustion engines.
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