Mining turtle 1x2

-- https://pastebin.com/rBb27uGy --
--1x2 tunnel--
--Program name "Tunnel2"--

print("Tunnel2")
print("1x2x2 chunks")
print("It will take 6 fuel to dig 4 blocks")
print()
print("Efficiency=1.5")


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

fuel=turtle.getFuelLevel()


--Moves forward 2 per cycle--
--Uses 4 fuel per cycle--
--2 fuel to move back 2 squares--

if (fuel-(fuel%6))/6 < 2 then
distance=0
else
distance=(fuel-(fuel%6))/6
end

print("Starting tunnel with ",fuel," fuel")
print("That equates to a ",distance*2, " long tunnel (Of size 2x1)")



--Go forward digging--
--Uses 4 fuel untis per cycle--
--Moves forward 2--
ForwardCycles=0
for x=distance*(2/3),1,-1 do
    if turtle.getItemCount(16)<1 then
    turtle.dig()
    turtle.up()
    turtle.dig()
    turtle.forward()
    turtle.dig()
    turtle.down()
    turtle.dig()
    turtle.forward()

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

--Heads back to start--
--Uses 2 fuel per cycle--

for v=ForwardCycles,1,-1 do
    turtle.back()
    turtle.back()
end

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