LavaBot

local function moveForward()
    while not turtle.forward() do
        turtle.dig()
    end
end

local function moveDown()
    while not turtle.down() do
        turtle. digDown()
    end
end

local function moveUp()
    while not turtle.up() do
        turtle.digUp()
    end
end

local function getLava()
    turtle.place()
    turtle.refuel()
    turtle.placeUp()
    turtle.refuel()
    turtle.placeDown()
    turtle.refuel()
end

term.clear()
term.setCursorPos(1, 1)
print("How far out?")
local input = read()

turtle.select(1)
turtle.refuel()
moveForward()
moveDown()
moveDown()

for a=1,input do
    getLava()
    moveForward()
end

turtle.turnRight()
moveForward()
getLava()
turtle.turnRight()

for a=1,input do
    getLava()
    moveForward()
end

moveUp()
moveUp()
moveForward()
moveForward()

local fl = turtle.getFuelLevel()
print("Fuel level:  "..fl)