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Investigate to see if it has a knock sensor. Traditionally, that's the sensor that retards the timing and reduces boost to save the internals from detonation.
There's a fine line between octane and FE. Many times, lower octane fuel forces better FE, but reduces performance. Sometimes, the higher octane fuel allows better low-RPM operation (and consequently improves in-town FE) but costs more per gallon.
It may require some testing to see what is both most efficient and cost-effective.
RH77
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“If we knew what we were doing, it wouldn't be called research” ― Albert Einstein
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