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From my reading I have found this:
Full synthetic beats any other except in price.
full synthetics will cost 2-6 times regular oil (most run $6-9) a quart.
full synthetics can go up to 25,000 miles before changing (with filter changes and top off after 8-10K miles).
Full synthetics help the car start smoother in cold weather. Mine is noticeably better.
Full synthetics offer a more constant performance over their life (will not gum up or degrade as much).
full synthetics can help Fuel Economy what % better, it is hard to tell but my best idea is between .5 and 1%. I have not seen any good ABA testing on this.
Now you can get some of the benefits if you use a blended synthetic oil. the rub here is cost is 2x regular but there is no required level to be called a blended synthetic (or semi synthetic).
In my book if you can shell out the money go for it. It is cheep insurance and may help make it last longer. Will you see MPG gains to off set the cost? No. If you can change at longer intervals then it might be worth it.
Does this cover what you wanted to know?
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