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All well and good, but I am trying to do my best with a 93 Chevy 383, cast iron 193 swirl port heads, and a TPI Intake with port injection.
Pistons and chamber and valves faces Ceramic Coated for the lean burn which all of believed runs hotter.
I have run 16.5 on a 2000 Mercury Grand Marques 4.6 engine and gained 5MPG and got her up to 35MPG at 1700RPMs and 65MPH. The engine did not fall apart.
The trick as I see it is to run lean ONLY when in a light cruse at highway speeds with no hills and no wind.
Rich
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