yeah. Funny thing here: I did exactly that with my 02 Odyssey. 45K mile drain/fill interval, Honda said. I did that.
And you know the story. At 73K miles, I replaced the transmission.
My mechanic berated me for not doing it every 15K. What the hell, I said--I followed Honda's directions.
Honda would also like me to buy a new car from them. Well, we all know what happend the LAST time I followed Honda's directions.
Back to the point: yes, the owner's manual of his 2010 Civic probably does not specify transmission drain/fill at 30K. But it's cheap, and given Honda's history, it's prudent.