5.7 versus 4.7 fuel economy
It's interesting that the 5.7 is EPA-rated slightly better than the 4.7 for fuel economy. 5.7 V-8 at 16/20 versus 4.7 at 15/18. It will be interesting to see the difference in real-world fuel economy.
Consider the smaller/less-powerful engine that has to work harder versus the larger/more-powerful engine that can just loaf along at partial throttle settings to get identical performance in a given vehicle. I'm sure that the 5.7 will use more fuel if all those frisky ponies are called on to work hard...
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