Ah, sorry, tab mixup on my end, the quote is from another article linked in the comments below; <a href="http:&#x2F;&#x2F;www.lowtechmagazine.com&#x2F;2014&#x2F;06&#x2F;thermal-efficiency-cooking-stoves.html" rel="nofollow">http:&#x2F;&#x2F;www.lowtechmagazine.com&#x2F;2014&#x2F;06&#x2F;thermal-efficiency-co...</a><p>Anyway, the question you pose is a good one.