Care to do the maths?, Take away the gas, leccy and coal.............................

[Highlander]

Can I ask why are you thinking of only wood, dont get me wrong wood is great, but wood alone doesnt burn very hot, it fires up good but produces a lot of ash that starts to cool down a fire,..and you use a hell of a lot

I think that the key to making saving here is to mix your fuels, I burn lots of logs, but I also mix it with coal, either lumps or cobbs, this keeps the ash to a lower content and the fire hotter, so you burn a lot less fuel, both logs and coal

If you mix your fuels, you can let your fire drop to a smolder and still hold in heat, if you only have logs, your fire will go out,... we could never keep our fire in all night by just burning logs, but we can easily by mixing the fuels