Welcome to the forum, I have the 06 LE as well with just about half of what you have on yours. It is reassuring that the van has much more life in it.
2004 XLE Limited with 211,000 miles and still going relatively strong thanks to an inexpensive mechanic. Bought it with 113,000 on it. I hope to get to moon distance mileage (238,000) on the old gal before I trade it in. But I'd also like to eclipse my highest mileage vehicle ever if the Sienna is willing. Put 276,000 miles on a 1987 Acura Integra I bought new.200,000 miles with 2004 LE. Original owner. I want 4 more years and 50,000 miles before the end.