Im still waiting on a correlation here.
You just admited that pushrods are generally smaller and lighter then regular engines.
You also admited that mpg is not correlated to liters of engine.
What do you have to fall back on now.. Still hp/liter has no meaning in the real world. It doesnt mean the engine will be lighter, it doesnt mean the engine will be more economical, it doesnt mean the engine revs higher, it doesnt mean the engine is smaller in size.
If you want the real deal pushrod versus ohc then there are advantages and disadvantages.
The push rod is cheaper to tune.
The dohc has a higher rev potential.
The pushrod is cheaper to produce
the dohc is less subject to energy loss through inertia(pistons).
These are all known things, but that still leads to a situation where the type depends on the usage.
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