I've got a 2008 Tacoma with the 4 cyl engine, 2.7 liter. I'm the original owner. I'm amazed when I read where people are replacing their plugs at 30,000 miles. You just don't need to change them that often.
I just hit 100,000, the truck still ran great, and my mileage was still up around 28 mpg on the highway. The original plugs looked fine, their gap was .043". They may have worn about .003" if they started out at .040". The plugs came out fine although the threads were dry, there were no problems getting them loose. I replaced them with NGK Iridiums and a little antiseize on the threads. The whole job took about an hour. I love 4 cylinder engines!
Next up is Ford "Exploader" with 118,000 on the original plugs. It still idles fine, by the way. Being a V-6 I'm sure it will be a PIA like others I've had.
Save the time and money and run those plugs longer!...........