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I run synthetic in everything I drive. Synthetics like Mobil1 EP and the like also save wear on your engine. Real synthetics don't push or squeeze out of bearings like conventional oils do. So, say you lean your engine out a little to pick up a few more mpgs and there is a little more detonation than normal. Under certain loads this would equate to a spun rod bearing and no less than having to turn the crank and put new bearings in. Synthetic buys a little bit more cushion for your bearings.
I upgraded some of the internal engine parts in my buick grand national. I yanked the engine and opened it up to find zero carbon buildup anywhere the parts just wiped clean and had near zero wear after 80K miles of spirited turbo driving. Even if I don't see a mpg gain, I'm running it to protect the engine.
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