If its a HEMI your after, the 09 is suppose to have a new engine with improved HP and MPG and a more effective MDS.
“The new 5.7-liter 09' HEMI V-8 engine will offer our customers better fuel economy, improved idle quality and overall refinement, along with more horsepower and torque,” said Bob Lee, Vice President – Powertrain Product Engineering Team, Chrysler LLC. “HEMI has always been synonymous with power, and now—thanks to VVT, expanded four-cylinder mode in our MDS system, and a host of other technologies—Chrysler’s new HEMI delivers more fuel efficiency and refinement, along with even more power.”
The HEMI’s new VVT improves fuel economy in two ways. First, it reduces the engine’s pumping work by closing the intake valve later. Second, it increases the expansion process of the combustion event. This allows more work to be transferred to the crankshaft instead of being rejected out of the exhaust port as heat. Essentially, VVT improves engine breathing, which improves engine efficiency and power.
MDS system seamlessly alternates between smooth, high-fuel-economy four-cylinder mode when less power is needed, and V-8 mode when more power from the new 5.7-liter HEMI engine is in demand. This optimizes fuel economy when V-8 power is not required, without sacrificing vehicle performance or capability.
An expanded MDS operating range in the new-for-2009 HEMI will allow customers to realize an even-greater fuel economy benefit. Chrysler estimates that since its inception of MDS in 2005, nearly 100 million gallons of gasoline have been saved, along with reduced carbon dioxide (CO2) emissions of close to a million metric tons.
I am planning on purchasing an 09' HEMI XK to use as my tow vehicle for the 06' XK....but I still have to run that idea past the wife. LOL
Current: 12' JK CODMW3 #1369 of 3600 4Dr. Past: 10' JK Rubicon 4Dr, 06' XK Limited 5.7L, 97' XJ Sport 4Dr
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Last edited by Phunkeydude; 06-12-2008 at 06:04 PM.