Well, all I can do is give a few points...
- Stoichiometry is at the heart of internal combusion engines - so a brief about what this is should be a starting point.
- Then you can talk about how engines evolved from being carburetted to ECU controlled (again the above point is at the heart of it) - the ECU uses stoichiometric values in its map to ensure that as much as possible of the fuel taken in is burnt without wasting any, basically to extract the maximum energy out of the fuel taken in.
- Then you can talk of multi-point fuel injection - how it ensures optimum fuel delivery to ensure that the engine burns as little fuel as possible whilst extracting maximum power from it (this also leads to a less polluting engine)
- You can talk of variable valve timing where the time the intake valve remains open is varied with the engine RPM - this ensure that no more than the minimum required air is taken in for the given RPM. Applied with point 1 this ensure minimum fuel consumed for that RPM - again leading to a cleaner engine.
There are many more points I am sure...but these are what I could gather from whatever limited understanding I have of the matter. Refer to this site: www.carbibles.com for more info...
 S = k.I^2, where S is the amount of stupidity a species possesses, I is the intelligence the species has and k is the universal constant of stupidity.
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