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I did a 6.0 for a customer awhile back. Went from 18 mpg to 28 mpg engine mods only. Too many to list here. PM me and I'll give you more details. Lower piston and rod weight allows you to remove material from crank counter weight. Instead of drilling to achieve balance shape leading edge of counter weight into an airfoil shape. Trailing edge can be a knife edge. Take a look at the high $$$$$$ aftermarket custom cranks for a visual. Mathematically compression and expansion ratio are the same. To achieve power and better FE it really the higher expansion ratio we are after. Both compression and expansion can be manipulated via valve timing events. Properly designed dished pistons are always the best. Smallest injector consistent with your power requirements produces better idle quality. (smaller fuel droplets) slighlty better mpg at low throttle settings for the same reason.
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