Have changed my Tundra at every 40,000. no fluid can last 100,000 and the tranny go for the long term.
There are plenty of Tundras running around with 300K on them that have not had meticulous tranny fluid changes
I would bet most of those don't see much towing and/or heavy off road use. I had mine changed at 70K and it made a huge difference in how the truck drove and shifted. I do tow a fair amount though, and also make lots of short trips.FWIW
