I assume that a round split into eights, rather than fourths, will dry/season quicker. More air and sun getting to the wood. I also assume that the smaller splits will catch fire quicker and may burn hotter but how is the overall burn of a box full of small splits compared to a box full of larger splits. For the sake of this question, let's also assume that it's all wood from the same tree. Larger splits should burn slower and longer, right? So, how much advantage is there in splitting the same rounds down to eighths instead of quarters? If it were a sure thing that the wood would be ready for next winter by splitting it down to smaller pieces, is it worth it in regards to the extra labor in doing so. I hope that makes some sort of sense.