I'm new to the RAV4s so I don't know of any little 'quirks' that I should be aware of.....that said..As far as the throttle body goes, I'd go to Advanced or AZ and get about four bottles of Techron (with Techroline). It's made by Chevron. I believe it's the best fuel system cleaner. It's not cheap. The bottles usually are only good for 10 gallons. So I'd use two for a fill up. Then skip a fill up and then do two more on the next fill up.
Have you used cleaners such as this periodically? If you do then it shouldn't be too bad. If you don't, then I would start doing it. I don't usually use the expensive stuff because I run a bottle of fuel system cleaner through every six or eight weeks.