Due to the current international oil crisis, “fuel efficiency” has become the car world’s mantra. In the past, the issue of global warming may have been the force behind attempts to develop technologies in aid of fuel economy, but the rising price of gas has made the need for fuel efficiency more pressing. A car’s fuel efficiency is based on its miles per gallon capacity. The higher the number of miles a car can go on a gallon of fuel, the more fuel efficient it is. Before the advent of hybrids, motorists who did not want to spend too much on gas simply chose small economy cars. When hybrid electric vehicles (HEVs came along, we were gratified to learn that 70 mpg on the highway was achievable. As we hurtle our way into the future, we will definitely witness even more amazing possibilities.
Fuel Efficient Technologies
The automobile industry has come up with multiple ways to enhance fuel economy. Most of the vehicles available on the market already feature the following technologies:
- Cylinder Deactivation. It deactivates cylinders when not needed, thus saving fuel.
- Integrated Starter/Generator Systems. They automatically switch the engine off when the car is stopped to lessen fuel consumption during idling.
- Direct Fuel Injection. It reduces fuel consumption and delivers better performance at the same time.
- Continuously Variable Transmissions. They provide an infinite number of gears causing smooth acceleration and better fuel economy.
Each automobile manufacturer worth its salt is toiling away to produce technological breakthroughs in aid of fuel efficiency. Some of the popular ones already in use today are:
- Diesel. Today’s diesels, such as ultra-low sulfur diesel and biodiesel, are definitely improved and much cleaner. Besides this, new systems such as Daimler AG’s BlueTec are designed to reduce diesel’s harmful emissions.
- Alternative Fuels. These are usually cheaper and greener than gasoline. Some of these are ethanol, vegetable oil, natural gas, and propane. Many cars are flex-fuel and can run on blends of gasoline and alternative fuel, such as ethanol. Natural gas, on the other hand, is being used to power many fleet cars. Honda has already introduced the Civic GX, currently available in NY and CA, which runs on natural gas.
- Hybrid Vehicles. What we have available to us now are mostly parallel hybrids. A parallel hybrid car is pushed by both a gas engine and electric motor whereas a series hybrid is pushed by the motor alone, which is recharged by the gas engine. There are now also hybrid cars converted into plug-ins. Conversion kits and services have been initiated by CalCars, a non-profit organization that promotes use of plug-in hybrid electric vehicles (PHEVs).
- Electric Vehicles. Cars are propelled by an electric motor powered by rechargeable battery packs. Some of the electric vehicles that have been produced are GM’s EV1, the Toyota Rav4 EV, the Tesla Roadster, and India’s REVA, which is the best selling electric car in the world.
- Fuel-Cell Vehicles. These are also pushed by an electric motor, which derives power from hydrogen fuel and oxygen from the air. Honda, for instance, has produced one called Clarity.
Today’s Best Fuel Efficient Vehicles
Even with all these technological accomplishments, carmakers still do not predict internal combustion engines (ICEs) from being completely phased out of the production line anytime in the near future. For many, ICEs are their only feasible option budget-wise. Fortunately, there are ICEs that can compete with hybrids with regards to miles per gallon capacity and have made the list for the most fuel efficient cars. When it comes to fuel economy, the following cars are the ones that rank highest with the first listed being the most fuel efficient:
While HEVs and ICEs have about 10-20 miles per gallon difference, a plug-in hybrid electric vehicle could double an HEV’s MPG capacity. PHEVs may not be a commercial reality just yet, but you’ll find that many manufacturers have already jumped in this bandwagon. The plug-in Prius has already received certification for use on public roads in Japan. Meanwhile, GM’s Chevrolet Volt has now a list of 10,000 members waiting to purchase their unit. Other manufacturers that are also developing their plug-in models are Ford, Fisker, Aptera, BYD, and Volkswagen.
Future Technologies
Another possibility for fuel economy involves vehicles running on water. Genepax of Japan, for instance, is developing the technology of Water Energy System with partner companies to commercialize their product. A WES-equipped electric vehicle could be something to look forward to in the near future.
Along the lines of hybridization, two other concepts are also being researched: hydraulic hybrid and hydrogen hybrid. A hydraulic hybrid uses hydraulic fluid to store and provide the energy to push the car. A hydraulic hybrid could end up cheaper and yet more powerful than an HEV. Hydrogen hybrids, on the other hand, are intended to have the economical traits of HEVs with the near-zero emissions of hydrogen fuel-cell cars. The plan is to produce an all-electric vehicle with an alternator to keep the battery charged by an ICE that runs on hydrogen, which, in turn, is kept going by an onboard hydrogen generating system powered by water.
Besides these, the possibility of solar cells being used to power motors of electric vehicles should definitely be tapped.
Vehicles of the Future
Technological visions are coming our way faster than we expect them. We can hopefully soon avail of low-energy vehicles such as the Aptera Typ-1 energy usage of 6 kWh/100kg, the Loremo LS 157 mpg, and the Volkswagen 1L, 1 liter of fuel per 100 km.
Other green concept cars that show potential are:
- Toyota FT-HS. It offers the combination of power and economy with its 400 hp engine and gas/electric hybrid technology.
- Chevrolet Equinox Fuel Cell. This SUV runs on hydrogen and has been designed for everyday drivers.
- Saab Biopower 100. This is a flex-fuel vehicle that can run on 100% pure ethanol as well as 100% pure gasoline.
- BMW Hydrogen 7. This is not a fuel-cell vehicle like others that are powered by hydrogen. This car simply burns hydrogen for fuel. It also works with regular gasoline.
- Photovoltaic Prius. This is a simple Prius with a solar panel placed on the roof. The add-on can improve fuel economy by at least 15 miles per gallon.
- Alé. The current version achieves 92 mpg, but FuelVapor Technologies is working on a series hybrid prototype that will boost fuel efficiency past the 100 mpg mark.
Vehicle Recommendations
Most cars that are ahead of their time fail to do well commercially. People are usually just not ready for revolutionary concepts. However, Toyota and Honda have been known to produce cars that are ahead of their time, risking ridicule in the beginning, but ending up setting trends for other carmakers to follow. When it comes to fuel efficiency, Prius and the Honda Civic Hybrid are clear forerunners. The Prius makes a better choice, however, for the possibility of being converted into a plug-in as the Honda Civic Hybrid as yet is not plug-in convertible. Besides this, the Prius has already been tested to do even better with solar panels on it. As for the cars that will be available in the future, the VW 1L with its 235 mpg promise is definitely something to get excited about. The mass production of hydrogen fuel-cell cars, such as the Honda FCX Clarity, and the idea of zero-emission are also something to look forward to.
Conclusion
In the current campaign for fuel economy, there are thankfully various technologies already available to us. Those who cannot afford to purchase a hybrid can still enjoy good MPG capacity in ICEs that have fared well in fuel efficiency ratings. However, for those who want to achieve the possible optimum fuel economy at present, having an HEV converted into a plug-in is the way to go. These are the options of today, but the future promises so much more. We may dismiss fuel efficiency as nothing but a mundane concern, but it is certainly propelling a fascinating ride into the future.