re: OB motorheads- will supercharging a 6.0L V8 gas engine

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It will get 0mpg after it blows up, so no.

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A Chevy small block can handle an insane amount of boost. If he's running low boost (which a street setup would) he won't be hurting the engine at all. Honestly, the extra airflow will increase engine efficiency immensely (not necessarily fuel efficiency).

Your fuel efficiency may not increase in city driving or anything but on the highway your engine will work less hard to get the same amount of air. The difference is pretty negligible though - maybe a modest 1-2 mpg on the optimistic end.

The reason a regular engine is "naturally aspirated" is because it can only take in as much air as nature provides. A turbo or a supercharger increases the engine efficiency immensely by forcing more in than nature can provide. The wise forced-induction guru Gale Banks explains that "air density" is more important than "air flow."

Here's an interview he did with Drive on why turbos are best (superchargers are less complex and don't require altering your exhaust system though): Gale Banks on Drive

But once you get the extra power, don't expect a huge boost in MPG. It may be like a 1-2 increase on the highway but you will get much better towing ability, not to mention gobs of horsepower and torque. The Chevy small block thrives on forced induction - it wakes it up like a beast. Your foot will get much heavier.