RobW.
Your usages splits statements of wood charcoal for the wife and kids; woodgas for you makes sense. A balanced approach.
No. Two component charcoal made fuel gas does not take up twice the volume of three component woodgas. They are different in engine power though.
Ha! You will see even me (a100% woodgas guy) saying this; will ignite a warring of one versus the other.
This is your topic. Let that warring take place on its own named topic.
Listen to those who have done both. And still use both for different applications. And that would be Don Mannes, Kristijan and only a few others. They are the Reasonables.
Regards
Steve unruh