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HP/litre is a good way of comparing engines.
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hp/liter shows nothing.. it effects nothing in the real world whatsoever.. Hp/per engine point is a good place for a real world non ricer comparison.. I donno about the porsche but the vette is up at the top of that pack.
hp/liter doesnt show efficiency either.. that would be gas usage by output of hp. Not related to hp/liter.. sorry.
in reality it shows nothing.. nothing at all
it doesnt show weight of the engine, gas mileage, performance of the car, or even emissions.. Its useless. Its a claim used by cry babies with a shitty car that have to point to an imaginary number to make them feel better.
edit.. and those magazines u listed quote cross drilled rotors as a performance object.. so your barking up the wrong tree with that comparison.