Depends on how much the right foot twiches.
Torque moves a MH, HP keeps it moving. Its a balance better mpg does
not usually mean better hill climbing.
Pick your crusing speed and select a proper set of cams, headers, and
exhaust system you can improve the MPG, but may be down on HP in the
mountains. If your goal in climb that hill with the big boys then you
will lose MPG. The factory makes a balance in the middle.
But the factory engines are built to a price, if you are willing to
spend enough you can have more HP and torque, but its not a simple
bolt on of a new air cleaner and a set of glass pack mufflers. But
requires a flowed intake manifold with a matching set of carefully
ported heads. The block will need an improved oiling system and a
matched set of pistons and rings to harness the increased air/fuel flow.
With the wrong choice you can lose MPG, torque and HP.
The bottom line is only a couple of MPG in either direction and maybe
10mph up simple hills and 5 MPH on the biggies.
The best and cheapest way to get better MPG is to slow down a bit.
WME.
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My question was simply ... if one makes these modifications, on average
what kind of mileage increase can one expect?
