The simplest ways to get better power and economy are to reduce parasitic power loss. This includes things like manual steering conversions, AC deletion, use thinner grade motor oil, reduce exhaust backpressure, as well as non-engine work like weight reductions. Reducing weight could be as simple as cleaning out your car or replacing a spare tire with a can of Fix-a-Flat to more expensive measures like fiberglass/carbon fiber hoods.
Power and economy can work hand in hand, but if one is going for maximum fuel mileage, power must be sacrificed.
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