Mining turtle 3x3

-- 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")


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

fuel=turtle.getFuelLevel()


--Moves forward 2 per cycle--
--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")
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
    if turtle.getItemCount(16)<1 then
    --First 3x3--

    --First 1x3--
    turtle.dig()
    turtle.dig(up)
    turtle.up()
    turtle.dig()
    turtle.dig(up)
    turtle.up()
    turtle.dig()

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

    --Second 1x3--
    turtle.dig()
    turtle.dig(down)
    turtle.down()
    turtle.dig()
    turtle.dig(down)
    turtle.down()
    turtle.dig()

    --Second 1x3 done--
    turtle.turnRight()
    turtle.forward()
    turtle.turnLeft()
    --Ready for third 1x3--

    --Third 1x3--
    turtle.dig()
    turtle.dig(up)
    turtle.up()
    turtle.dig()
    turtle.dig(up)
    turtle.up()
    turtle.dig()
    --Third 1x3 done--
    turtle.dig()
    turtle.forward()
    --Ready for next 3x3--


    --Second 3x3--

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

    --Second 1x3--
    turtle.dig()
    turtle.dig(up)
    turtle.up()
    turtle.dig()
    turtle.dig(up)
    turtle.up()
    turtle.dig()
    --Second 1x3 done--
    turtle.turnLeft()
    turtle.dig()
    turtle.forward()
    turtle.turnRight()
    --Ready for third 1x3--

    --Third 1x3--
    turtle.dig()
    turtle.dig(down)
    turtle.down()
    turtle.dig()
    turtle.dig(down)
    turtle.down()
    turtle.dig()
    --Third 1x3 done--
    --Second 3x3 done--
    turtle.dig()
    turtle.forward()
    --Cycle complete--
    --21 Fuel used--


    moved=moved+1
    print("Fuel remaining:",turtle.getFuelLevel())
    end
end


for y=moved,1,-1 do
    turtle.dig(back)
    turtle.back()
    turtle.dig(back)
    turtle.back()
end
end
--Prints final messege--
print("Tunnel finished")