Well, I've read every thread on here, and there seems to be just as many saying that premium is a must, as there are saying it is a waste and not to believe the owner's manual. I currently have a 2002 Nissan SE-R Spec V, that I'll be trading in shortly. I'm very interested in a 2006 4Runner Sport Edition 4WD V8. The gas mileage is the only thing holding me up. The actual mileage is one thing, but adding to it that Toyota is recommending premium is another. I've called more than one dealer in my area and have heard both responses:

1) It will run fine on Regular (87) unleaded and will not void warranty.
2) You have to run premium or you'll get knock and ping, damage your motor, and void warranty.

Will the 2006 i-Force V8 (or the 4.0L V6) run fine on regular to save money or is premium a must? The 4Runner says premium but the Tundra says regular. I'm confused. Please help as this sways my decision towards a 4 Runner or a Camry SE V6