Mining turtle 1x1

-- https://pastebin.com/RXqJpbui --
--1x1 tunnel--
--Program name "Tunnel1"--

print("Tunnel1")
print("1x1x1 chunks")
print("It will take 2 fuel to dig 1 blocks")
print()
print("Efficiency=2")


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

fuel=turtle.getFuelLevel()


--Moves forward 1 per cycle--
--Uses 1 fuel per cycle--
--1 fuel to move back 1 squares--

if (fuel-(fuel%2)/2) < 1 then
distance=0
else
distance=(fuel-(fuel%2)/2)
end

print("Starting tunnel with ",fuel," fuel")
print("That equates to a ",(distance-(distance%2))/2, " long tunnel (Of size 1x1)")

moved=0
--Goes forward--
--Uses 1 fuel unit per cycle--
for i=(fuel-(fuel%2)/2)/2,1,-1 do
    if turtle.getItemCount(16)<1 then
    turtle.dig()
    turtle.forward()

    moved=moved+1
        if moved%5==0 then
        print("Fuel remianing:",turtle.getFuelLevel())
        end
    end
end


--Starts to head back--
print("Heading back now")
print("Fuel remaining:",turtle.getFuelLevel())

--Moves back to start--
--Uses 1 fuel unit per cycle--
movedback=0
for x=moved,1,-1 do
    turtle.back()
    movedback=movedback+1
    if movedback%5==0 then
        print("Fuel remaining:",turtle.getFuelLevel())
    end
end



--Prints final messege--
print("Tunnel finished")
print("Fuel remaining:",turtle.getFuelLevel())