Premium fuel does help
Premium fuel contain a multitude of additives and cleaners that regular fuel does not thus will prevent premature carbon deposits, a major source of engine deterioration over time.
Premium fuel will also detonate at the right time while regular fuel is prone to detonate early hence leaving carbon deposits.
Premiu fuel will also improve your fuel mileage but give yourself time (2 tank fuls) to notice a difference.
I have used premium fuel in all my cars and a difference can be felt when regular fuel is used. There is reason why performance oriented vehiles run on premium fuel, sure the RAv4 may be in the same category but it will halp kep the engine working cleaner and better over time and that extra few dollars at each fill up may be worh rather than de-carboning your engine.
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