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I didnt admit mpg is not correlated to liters of engine - i havent compared them.... They are however correlated, negatively. GENERALLY as displacement increase, mpg decreases.
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bullshit. The corvette gets 28 mpg. I can show you many much smaller v6s that dont achieve that number. I can show you a ferrari 360 that gets worse gas mileage.
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It is related to the efficiency of the engine as i've said many times - as in how much power you get out of the engine compared to the air/fuel mixture you put in. It takes revs into account because the figure you use for HP is when the engine is at maximum revs.
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first off.. the figure you use for hp isnt when the engine is at maximum revs.. thats false.
That depends on the car.
2nd it doesnt deal with rpms in any way shape or form.. air/fuel is a function over time. as determined by rpm. Thus mpg in a hp/liter car still may be horrid and often is. Hp/liter has no effect on the real world. None.
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Its by no means the only thing that can and should be used but is a good figure.
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It useless. You just admited it means nothing and is correlated to nothing in the real world. ITs at best a purely academic point.. at worst its pure rice.