Fuel econony will not be affected by opening the jet a couple of thousands. It can almost be like comparing an O-360's cruise consumption to that of a 320's. It is all dependant on the throttle operator. Many times the main reason in opening it up is to make the motor "happier", or closer to its most capable power curve, not to make more top end power.
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If you are 90% efficient, and your buddy who checks the 10% you missed is also 90% efficient, together you're 99% efficient.
RV-7A - empennage done minus glass
wings nearing completion
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