J"s Lexus 04

I have Michelin Energy MXV4 235/55/ R18 tires ( $209 at Costco)on my 2004 RX330. It seems as if I have to replace these tires around 25k-30K miles, which seems too soon. The tires run smooth, however, I'd like a balance of smooth running and longer lasting. I'm hearing good things about the Bridgestone - Dueler H/L Alenza ($ 187 at Costco). Please let me know what you think