[brucepick]

I'm curious to see the results.

My guess is that you'll have a nice increase in FE but a reduction in available power. This probably won't be an issue as long as you don't have a steep upgrade or a very heavy load - in which case you'll need most of the available power of the engine's stock configuration.

In any case - in my humble opinion of course - North American market vehicles are sold with a good bit more power than they need, so you'll likely do just fine if this does indeed reduce your available power.