If you don't want to waste fuel when refining stuff, here's an easy rule of thumb:

If you're making metal ingots, you'll need the number of ore divided by three in wood. For example, if you have 150 ore, you'll need 150/3=50 wood. Conversely, if you have 50 wood, you can refine 50*3=150 ore.

If you're making gasoline, you'll need 5/6 of the number of oil in hide and 1/6 of the number of oil in wood. So if you have 96 oil, you need 80 hide and 16 wood.

Thatch is 1/4 as fast as wood which is 1/2 as fast as sparkpowder.

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