The only thing I could think of is if your Sienna was equipped with V speed rated tires from the factory. The speed rating is best described as a sort of performance rating, at least here in the US. If this is what your friend is referring to, then he/she is right that V-rated tires are typically more expensive than lower-rated tires, although "at least $800 for a set of 4" is simply throwing numbers out there. HOWEVER, on most vehicles that came from the factory with a V-rated tire, it is perfectly safe to drop down to an H-rated tire with no adverse effects on vehicle handling and performance. And just a reminder, AWD vehicles need to have the tires replaced in sets of 4, as putting 2 new tires on the vehicle with 2 worn tires can cause drivetrain problems.
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