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The better for fewer cylinders, however, is usually because 4 cylinders usually come in smaller, more efficient cars. Put a 4 cylinder in an H2, the gas mileage won't get any better.
Also, the throttle detent spring helps primarily at cruise, so you can maintain a steady, light throttle to hold speed. The load theory works, that's why P&G works better than steady state. You can spend less time accelerating, but at a faster rate, keeping the engine in a more efficient part of the BSFC map. Then, you can coast and repeat. This is better than running a lightly loaded engine constantly.
With diesels, however, the fuel consumption is far more linear with load, so while more load (around 75-85%) is still more efficient, the difference is less.
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