What are the boost levels of these modern engines though, Bill? I've put superchargers on 10.5 and 10.75:1 engines that run 93 octane and are street driven regularly. Boost is only 5-7 psi though. That's all you get from Magnachargers and ProChargers with their stock applications. Boost is boost regardless of it's from a turbo or supercharger.

More than likely, what you'll want to do to achieve your efficiency goal is lower boost and raise compression. However, given the small displacement of your engine, this may backfire severely as the engine doesn't make good power when not boosted.