As one data point, my 2012 2AR-FE has gotten mostly 10k runs with M1 EP 0w20 (plus some TGMO before I bought it and a few other oils along the way) and OE filters. The odometer is sitting at around 183,000 miles right now, and there is no consumption or leaking whatsoever. (The level stays right on the full mark over the entire 10k run - it drops imperceptibly if at all on that run.) It still routinely beats MPG ratings. I drive a solid mix of city (15-30 minute trips but rarely shorter, usually on the freeway) with frequent long highway runs too. I'm targeting 300k for the car.
I've considered getting a UOA but never bothered considering I'm using an oil rated for double that interval. Seems like a decent margin of error to me.
For some fun math, since I have to pay a shop for oil changes (can't do maintenance at the apartment), following the interval vs. changing at 5000 miles just to be safe, since "oil is cheap" should save me around $3000 or so over my targeted life of the car, 300k. It's certainly not chump change and I'd far rather have the extra cash (those are some expensive "warm fuzzies"). Further, changing at 3k miles would cost me an extra $7000 vs. my current plan. So I'm not sure that "over maintaining" is an obviously logical option. (For the math, consider that you'd need 30 oil changes over 300k if you maintained it by the book, 60 if you did every 5k, and 100 if you did every 3k. I approximated a cost of $100 per oil change, not unreasonable for synthetic oil at a shop, though I do try and bring my own Mobil 1 when possible which saves a bit.
