how to fuel mining turtle
-- https://pastebin.com/0ybY4JMt --
--3x3 tunnel--
--Program name "Tunnel3"--

print("Tunnel3")
print("3x3x2 chunks")
print("It will take 20 fuel to dig 18 blocks")
print()
print("Efficiency=1.111")


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--Refuels--
for i=16,1,-1 do 
	turtle.select(i)
    turtle.refuel()
end

fuel=turtle.getFuelLevel()


--Moves forward 2 per cycle--
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--Uses 18 fuel per cycle--
--2 fuel to move back 2 squares--

if (fuel-(fuel%20))/20 < 2 then
distance=0
else 
distance=(fuel-(fuel%20))/20
end

print("Starting tunnel with ",fuel," fuel")
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print("That equates to a ",distance*2, " long tunnel (Of size 3x3)")



--Go forward digging--
--Uses 18 fuel untis per cycle--
--Moves forward 2--
while true do
moved=0
for x=distance,1,-1 do
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    if turtle.getItemCount(16)<1 then
	--First 3x3--
	
	--First 1x3--
	turtle.dig()
    turtle.dig(up)
	turtle.up()
	turtle.dig()
    turtle.dig(up)
	turtle.up()
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	turtle.dig()

	--First 1x3 done--
	turtle.turnRight()
	turtle.dig()
	turtle.forward()
	turtle.turnLeft()
	--Ready for second 1x3--
	
	--Second 1x3--
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	turtle.dig()
    turtle.dig(down)
	turtle.down()
	turtle.dig()
    turtle.dig(down)
	turtle.down()
	turtle.dig()

	--Second 1x3 done--
	turtle.turnRight()
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	turtle.forward()
	turtle.turnLeft()
	--Ready for third 1x3--
	
	--Third 1x3--
	turtle.dig()
    turtle.dig(up)
	turtle.up()
	turtle.dig()
    turtle.dig(up)
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	turtle.up()
	turtle.dig()
	--Third 1x3 done--
    turtle.dig()
	turtle.forward()
	--Ready for next 3x3--
	
	
	--Second 3x3--
	
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	--First 1x3--
	turtle.dig()
    turtle.dig(down)
	turtle.down()
	turtle.dig()
    turtle.dig(down)
	turtle.down()
	turtle.dig()
	--First 1x3 done--
	turtle.turnLeft()
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    turtle.dig()
	turtle.forward()
	turtle.turnRight()
	--Ready for second 1x3--
	
	--Second 1x3--
	turtle.dig()
    turtle.dig(up)
	turtle.up()
	turtle.dig()
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    turtle.dig(up)
	turtle.up()
	turtle.dig()
	--Second 1x3 done--
	turtle.turnLeft()
    turtle.dig()
	turtle.forward()
	turtle.turnRight()
	--Ready for third 1x3--
	
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	--Third 1x3--
	turtle.dig()
    turtle.dig(down)
	turtle.down()
	turtle.dig()
    turtle.dig(down)
	turtle.down()
	turtle.dig()
	--Third 1x3 done--
	--Second 3x3 done--
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    turtle.dig()
	turtle.forward()
	--Cycle complete--
	--21 Fuel used--
	
	
    moved=moved+1
	print("Fuel remaining:",turtle.getFuelLevel())
	end
end
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for y=moved,1,-1 do
    turtle.dig(back)
	turtle.back()
    turtle.dig(back)
	turtle.back()
end
end
--Prints final messege--
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print("Tunnel finished")
how to fuel mining turtle