Respectfully, you will notice I said "...of the same horsepower..." If th engine"s design point is at 5000 ft altitude, you can size the displacement for that design point and it will have a bunch more power at sea level.
But sure the altitude lapse rate for a turbo sized at sea level, in general, is less than that of an NA engine sized at sea level. In fact if the compressor outlet pressure is held constant by a control system, there is no altitude lapse.
The turbo makes some things easier for the manufacturer but the owner has to pay for the operating and maintenance costs and my point is the more moving parts, the more that can go wrong and it will happen on the owners nickle.
And I was refering to tractor applications not trucks. With trucks, power to weight is an important factor.
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