Spark plug change

I read in the owners manual that spark plugs are supposed to be changed every 60000 miles on v6 Tacoma’s. That seems a bit low when most cars and trucks now a days require you to change the plugs every 100,000 miles. I got 78,000 miles on my seventeen and the stealership never mention this while serving my vechile. My gas mileage is still good but I am going to go ahead and have the plugs replaced. The stealership wants 540.00 to do it. I told them to kick rocks.