I have been told by a Chrysler engineer that the "new" 5.7 litre HEMI engine now appearing in 2009 with variable valve technology is going to be one of the only V8 engines that will survive in the future. It can be tweaked to achieve more HP - close to the 6.1 litre engine. (They are only about 50 HP different on paper)

The 4.7 engine is not very fuel efficient and does not have MDS technology needed to achieve high MPG.

The next big thing will be a MDS 6 cylinder engine that will achieve approx 300 HP while delivering good MPG.