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I'm guessing you don't have an electronic wastegate, and I don't know how much they cost to install, but opening it to bypass the turbine at cruise somehow would probably help a little. I doubt that your engine would be anywhere near full capacity running NA on the freeway, and pumping all that excess air through the engine in theory reduces the efficiency by a lot, even if it doesn't cost much energy to pump the air.
I have never actually looked closely at a turbocharger, but I'm guessing that the high temperatures at the exhaust mean that a spring loaded wastegate would have to have the spring be sitting at some distance from the wastegate itself, so if you could attach a cable to the wastegate actuator rod or something and have a manual turbine bypass, that could do the trick?
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