Munchdew

local function refuel()
    local fuelLevel = turtle.getFuelLevel()
    if fuelLevel == "unlimited" or fuelLevel > 0 then
        return
    end

    local function tryRefuel()
        for n=1,16 do
            if turtle.getItemCount(n) > 0 then
                turtle.select(n)
                if turtle.refuel(1) then
                    turtle.select(1)
                    return true
                end
            end
        end
        turtle.select(1)
        return false
    end

    if not tryRefuel() then
        print( "Add more fuel to continue." )
        while not tryRefuel() do
            sleep(1)
        end
        print( "Resuming Chopping" )
    end
end

logs = 0
for i = 1, 1000 do
    refuel()
    turtle.select(16)
    while not turtle.compare() and turtle.detect() do
        turtle.select(2)
        tutle.dig()
        logs = logs + 1
        turtle.forward()
        while turtle.compareUp() do
            refuel()
            turtle.digUp()
            logs = logs + 1
            turtle.up()
        end
        while not turtle.detectDown() do
            refuel()
            turtle.down()
        end
        turtle.back()
        for x = 2, 15 do
            refuel()
            turtle.select(x)
            turtle.dropDown()
        end
        print("Total Logs Chopped: " + logs)
        refuel()
        turtle.select(16)
    end
    x = 2
end