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I am currently training my firemaking level. At what level should I switch from willow logs to maples?

Depends really. You'll burn at the same rate, so theoretically you'll want to switch as soon as you can. But since Willow logs are quite a bit cheaper, you might as well save your money and burn them till you're 5-10 levels above Maple. This will ensure that there would be absolutely no hesitation in lighting, slowing down that first light of the row.

whatever level you can start burning maples is when xD

Most people do either Willows or Maples all the way to 99. It depends on you.
IF you dont want to spend a whole lot do willows but it will take forever. If you dont care about money then buy maples and it will be faster to 99.
If your going for 99 or not, do maples for a faster way to which ever level you want

Like I've said, doesn't matter how you do it. I changed to maples at 80 which seemed like a pretty good switch. As someone put it to me, "If it takes longer to burn the willows than to get the money and buy maples, you might as well go with maples."

Thanks everybody for thier input. I have taken them into consideration and bought all the logs I need for 99. So now I just have to light them all.

Please lock.