What are the areas of waste, or loss of efficiency, Guest?
Friction? Waste Heat? Incomplete combustion of fuel? Energy wasted as acoutic emissions? etc. (ignoring parasitic loads, and other vehicle system issues.)
Pick one and try to reduce it.
Pick two and see if the interactions are significant themselves.
Certainly you might have some idea how to reduce these.
Look at a DOE for the changes you propose, (high and low or on or off for each)a TaguchiL8Matrix should do the trick to handle two or three variables and their interactions.
the Taguchi link above illustrates a different number of variables, but is adequate for the task you describe.
milo
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People say between two opposed opinions the truth lies in the middle. Not at all! Between them lies the problem, what is unseeable,eternally active life, contemplated in repose. Goethe
Hint: using onboard electrolysis to generate hydrogen gas from water to be burnt in your engine will NOT improve the efficiency of your engine no matter what some stupid people may tell you.
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If only you knew the power of the Dark Side of the Force
look on the inter net at power plus units.they let the fuel flow through a magnetic cylinder lined with tin and magnets.the tin fixes it self to the hydro carbon molecules and stretches them out for a cleaner burn.you could try using a 12v on board electro magnet system to improve the idea.this would make units smaller and more affective.like a BMW m3 we have toyed with down to 0 emissions,