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" Automakers Press to Boost Gasoline Engine MPG   Some of the world&amp;#039;s major automakers are accelerating efforts to improve the fuel efficiency of conventionally powered vehicles, The Wall Street Journal reported.   With oil prices creeping past $50 a barrel, the goal is to boost the mileage of today&amp;#039;s gasoline-engine technology without resorting to expensive batteries or hybrid gas-electric systems.   Among the new technologies under study:   Homogeneous-Charge Compression-Ignition, or HCCI. An HCCI engine, unlike a conventional gasoline engine, doesn&amp;#039;t use a spark plug to ignite the air-fuel mixture to create power. Instead, the air-fuel mixture is compressed by the piston until rising heat inside the chamber ignites the mixture \u2014 a process similar to that of a diesel engine. The technology is believed capable of providing as much as a 30% boost in the fuel economy of a gasoline engine. The problem, however, is that it&amp;#039;s extremely difficult to make an HCCI engine run smoothly at very low and extremely high speeds because engineers cannot control the spontaneous combustion in those ranges.  Gasoline direct-injection technology. Unlike today&amp;#039;s fuel-injection technology, in this system the air and gasoline are introduced into the combustion chamber directly and separately. The system helps boost fuel efficiency.   Jeep Announces 2005 Wrangler Unlimited Rubicon Pricing   Jeep said the price of its new 2005 Unlimited Rubicon will be $28,825.   The long wheelbase Unlimited is 15 inches longer than the standard Jeep Wrangler, with twice as much cargo volume.   The 2005 Jeep Wrangler Unlimited Rubicon&amp;#039;s off-road system includes front and rear Dana model 44 axles with &amp;quot;air-actuated&amp;quot; Tru-Lok locking front and rear differentials, a Rock-Trac 4:1 low-range transfer case, four-wheel disc brakes and 31-inch Goodyear Wrangler &amp;quot;Maximum Traction/Reinforced&amp;quot; tires, which provide an extra one-half inch of ground clearance versus the standard Jeep Wrangler Unlimited model.   Prices for 2005 Jeep Wrangler models, including $610 for destination, are listed below:   Jeep Wrangler SE $18,510 Jeep Wrangler Unlimited $24,355 Jeep Wrangler Rubicon $27,825 Jeep Wrangler Unlimited Rubicon $28,825  "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.roadandtrack.com/car-culture/a10378/automakers-press-to-boost-gasoline-engine-mpg/>