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Here - I'll even give examples of how to post theories of operation:
Lean burn works to improve fuel economy by introducing less gasoline into each cylinder to provide an AFR greater than 14.7:1. More air is sucked into each cylinder for a given amount of gasoline, to achieve this. This has the result of reducing intake manifold vacuum, causing the engine to work less to maintain that vacuum, which causes the engine to burn less gasoline as a result.
Inflating tires 5 psig over rated pressure works because it decreases the rolling resistance of the tires. The engine does not have to work as hard to push the vehicle down the road, as a result, which causes the engine to burn less fuel as a result.
Installing a truck aerocap on a truck improves fuel economy because it makes the truck more easily able to push itself through the air as it moves down the road. The truck engine does not have to work as hard as before, so the truck does not have to burn as much fuel as before.
See? Simple! Those examples took me all of 3 minutes to type, too! No cumbersome college lecture about the hallowed history of some vehicle part needed.
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