When powered by gasoline, the C-MAX Energi uses the all-new 2.0-liter Atkinson-cycle four-cylinder engine - powerful and fuel efficient and among the most advanced non-turbocharged four-cylinder powertrains Ford has ever offered.
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As with the Optima, the Regal offers a choice of two direct fuel-injected four-cylinder engines.
The engines do away with expensive cylinder heads where fuel combustion takes place.
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Several different engines can be dropped in, like a turbo--necessary for Saab's peppy image--or a fuel-efficient four-cylinder for the Malibu.
Several different engines can be dropped in: a turbo, necessary for Saab's peppy image, or a fuel-efficient four-cylinder, for the Malibu.
The EPA pulled off the feat by sharply increasing the amount of oxygen-poor exhaust that is recirculated into the combustion chamber and increasing the pressure of the fuel being forced into the cylinder.
Like the Caliber, they feature powerful, more fuel-efficient, four-cylinder engines. (The Sebring's 2.4-liter version churns out 170hp).
What helped the 911 is Porsche's fuel-efficient, six-cylinder engine relative to the rest of this group.
They won't haul or tow as much cargo as the bigger Chevrolet Silverado and GMC Sierra but will offer four-cylinder engines, better fuel economy and should cost less.
The Wrangler is an awesome rig, but it desperately needs a small 4 cylinder diesel offering to improve fuel mileage.
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Vehicles with fuel-saving six-speed transmissions or cylinder deactivation systems let a big V8 engine run on just four cylinders on the highway.
The 4-cylinder vans will get a combined fuel efficiency of 25 miles per gallon, nearly double what the Ford Crown Victoria gets.
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It works by forcing fuel directly into the combustion chamber of each cylinder to mix air and gas simultaneously at the point of combustion, rather than mixing air and gas in a separate chamber like more conventional engines.
So luxury automakers are responding, not only with four-cylinder engines, but hybrids and other fuel-saving technology as well.
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The 2014 Jeep Cherokee will also be up to 45 percent more fuel efficient when equipped with a standard four-cylinder engine, which puts out 184 horsepower.
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Essentially leveraged as a form of high-tech turbocharging, here a small electric motor gives a modest fuel-free power boost to a direct-fuel-injected 2.4-liter four-cylinder engine.
But industry buzz is around the success of a turbocharged, six-cylinder Ford engine that uses a fifth less fuel than older, larger V8 engines of similar power.
Fuel economy ratings at or above 40 mpg on the highway is becoming common among small cars, with midsize models leveraging turbocharged four-cylinder engines to deliver V6-like acceleration with fairly frugal fuel economy.
Next year Ford will offer a new Focus compact car in Europe, with a one-litre, three-cylinder engine that performs as well as the 1.6 litre, four-cylinder engine it replaces, yet uses about 20% less fuel.
Using ethanol fuel, it is possible to make 2 to 2.5 L 4 cylinder engines that have the same or more power than the gasoline V8s currently used in even the largest trucks or SUVs.
The fuel would be injected as two beams, which would spiral their way down the cylinder, with the hydrogen chasing the boron and colliding with it.
Fuel economy gets better, especially with the 8-speed transmission or the four-cylinder turbo.
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