Just wondering how big the firebox is in the Oslo?2.67 cu ft in the Rangeley.Supposed to be 10% overall more efficient than the Oslo but rates the same 70.000 btu and 2000 sq ft heating area.The Oslo lists 9 hr burn and the Rangeley lists 8+ and i have gotten 9 so far.We all know that listings are no better than our own findings.The Oslo sure looks better.Just kinda comparing,burning time as well as wood.