Farming

turtle.select(16)
n = turtle.getFuelLevel()

for a = 1,5 do

for b = 1,21 do
turtle.forward()
turtle.digDown()
turtle.placeDown()
end
turtle.forward()
turtle.turnLeft()
turtle.forward()
turtle.turnLeft()

for c = 1,21 do
turtle.forward()
turtle.digDown()
turtle.placeDown()
end
turtle.forward()
turtle.turnRight()
turtle.forward()
turtle.turnRight()

end
turtle.turnRight()
turtle.forward()
turtle.select(1)
turtle.dropDown()
turtle.select(2)
turtle.dropDown()
turtle.select(3)
turtle.dropDown()
turtle.select(4)
turtle.dropDown()
turtle.select(5)
turtle.dropDown()
turtle.select(6)
turtle.dropDown()
turtle.select(7)
turtle.dropDown()
turtle.select(8)
turtle.dropDown()
turtle.select(9)
turtle.dropDown()
turtle.select(10)
turtle.dropDown()
turtle.select(11)
turtle.dropDown()
turtle.select(12)
turtle.dropDown()
turtle.select(13)
turtle.dropDown()
turtle.select(14)
turtle.dropDown()
turtle.select(15)
turtle.dropDown()

for d = 1,9 do
turtle.forward()
end
turtle.turnLeft()

z = turtle.getFuelLevel()

print("Total Fuel remaining: " .. z )
print("Total Fuel used: " .. n - z )
if z < ( n - z )
 then print("Refuel needed.")
 else print("No refuel needed.")
end