Short trips and idling are both terrible for oil life. I drove mostly highway with my Si and my oil light would come on at about 8k. If I was in your situation, I'd use high quality oil and just change it every 5k.
Ktuner is a better bang for buck. If I was doing it again I'd get that first. That being said, I loved the sounds the PRL CAI make... but it's really mostly just that.
Yes, sometimes. I just don't want anyone seeing this thinking they're owed a new clutch just by showing up at the dealer. These people tend not to give things away for free. It's a TSB, not a recall.
This is a great point. What weight oil did they use if it wasn't synthetic?
Either way, I wouldn't keep it for more than 5k miles and I wouldn't beat on it. I'm sure you'll be fine otherwise.
The car doesn't know its factory oil. All oil will "last the same" if driven under the same conditions. You're giving the car entirely too much credit.
I figured a Type R owner would be jumping at the opportunity to change their oil... I wouldn't keep oil for that long on a car I didn't like.
Short trips are the worst for fuel economy (and oil) but that seems really bad. Maybe schedule a long trip on the highway to see what kind of fuel economy you get then.
In the meantime, check your tire pressure and engine air intake filter.
I am far less optimistic. The k20a3 in the EP3 never got any real attention because the k20a/a2 (and even k24) was around at the same time. With the k20 from the CTR or even the L15b around, dumping a ton of money and time into the k20C2 will bring diminishing returns