The Insight calls for 0w20. If I want the engine to last for several hundred thousand more miles I'm going to go with what Honda specified, rather than risk any small chance of something bad happening by using a thinner oil, just to try and capture some probably infinitesimally small fuel savings.
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2013 Toyota Prius C 2 (my car)
2015 Mazda 3 iTouring Hatchback w/ Tech Package (wife's car)
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