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This is my design for a fuel efficient furnace, it uses analong redstone to count the number of items going into the furnace and releases 1 piece of coal for every 8 items that flow through.

hmm neat but i think i know how you could improve it read the list below
~Use charcoal
~If a log comes through then the charcoal goes back in
~If somthing cant be smelted it comes out

I made one of these but I took a different approach. I based mine off the filter design so when there are at least 9 items in a hopper it triggers a timer and dumps exactly 8 items into the furnace, which is loaded with coal at all times. It then sends a signal to check to see if there is more ore to smelt.

I hooked this up to another automatic filter system that will automatically add coal and the proper ore and then move these to a storage room so all that needs to be done is dump all items into a single chests and it will sort, and smelt efficiently.

No need to input coal one at a time, just input 8 items at a time and constantly restock with coal. Much easier.

Quote from Malacodor

This is a brilliant (but slightly flawed) construction!

If there's for example one block of gold ore in the furnace and 5 stacks of iron ore in the hopper above you have a problem. I'd rather build one device for each ore and link them to an item sorter.

I don't know what you put into the hopper to produce the strength 6 signal, but I'd suggest two cheap non-stackable items like wooden shovels.

later in the video I have a second design that solves this problem by having a chest between the dropper and the furnace to act as a buffer. That way you can throw in a mix of different items.

to produce the 6 signal strength i had 2 stacks of wooden buttons, but 2 shovels is a much cheaper option

My only issue with this is that it can't use mixed fuel streams. I've been trying to design one that, basically, checks whether it as seen a smelted item leave the furnace in the past 10.5 seconds. If not, it gives the furnace one more fuel item. The downside is that you have to keep the system packed, in the input, so you can really only use it with one smeltable item (mine is cobble), but the result is that it only can use coal or blaze rods.

Still trying to get it to work, though. If you can come up with a 1 or 2 wide tileable version of this, I'm sold.

Would this work with a lava bucket,seeing how using a lava bucket has the longest burn time (1000 sec).

Quote from R3lliklaire5

Would this work with a lava bucket,seeing how using a lava bucket has the longest burn time (1000 sec).

I don't think that i would be automatic anymore, unless you could find a way to remove the empty buckets.