The reason Toyota went to 0w20/5w20 is for C(orporate) A(verage) F(uel) E(conomy), or CAFE as did many other North American car companies. If a car company gets their overall fuel economy spread across the entire fleet lets say in North America, they can make certain claims, for marketing etc. Toyota came out with a TSB March 29,2006 saying that it was now the oil of choice for toyota vehicles, so is 5w30 no longer valid for the past 20+ years? Engines suffer prematurely from neglect rather than the wrong weight of oil.
Do some reasearch on Bob is The Oil Guy and you will find a whole world of deviants who live and breathe oil. Only then can you make an informed decision.
If you really want to maximize fuel economy, whatever oil you use in whatever vehicle, use the 0wXX version(0w20,0w30,0w40). The most gas efficient engine warms up quickly and the 0wXX will get you there faster than its equivalent 5wXX,10wXX,15wXX). Nearly all wear occurs at startup, and 0wXX will help you there as well.
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