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Is it safe to refuel my '10 prius with an 87 octane rating as opposed to the suggested 89 in

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Old 07 Jul 2010, 09:00 am   #1 (permalink)
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Default Is it safe to refuel my '10 prius with an 87 octane rating as opposed to the suggested 89 in
the owner's manua? Also, what is that vent next to the right rear passenger's seat? Couldn't feel anything even if a/c is on.
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Old 07 Jul 2010, 09:04 am   #2 (permalink)
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you can run lower octane fuel but you might get knocking, decreased mileage, and a decrease in power. your best bet is to always run the octane the manual states.
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Old 07 Jul 2010, 09:06 am   #3 (permalink)
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The car's computer will sense the change in octane and adjust to it over time. Toyota may have suggested the slightly higher octane rating to get a better EPA mileage figure.































One caveat: If you are at a higher altitude, use the 89 or whatever is close to that. When we go to Utah they have 85 octane and my car runs noticeably worse on it so I step up a grade.































An alternative my father-in-law practices: fill up with 89, then at half a tank, put in 87. Keep alternating this way and you'll only marginally be below the 89 recommended and save a few pennies.
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Old 07 Jul 2010, 09:10 am   #4 (permalink)
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That's a misprint in the manual.































Toyota has already clarified to online Prius communities like Priuschat that they meant to print 87-octane. http://priuschat.com/forums/gen-iii-...-whats-up.html































87-octane is in fact the recommended fuel for the Atkinson-cycle engine in the Prius.































You don't want to use a higher-octane fuel (which is more resistant to ignition) because the Atkinson-cycle engine in the Prius keeps its valves open longer. You want to use a fuel that burns faster so it doesn't ignite in the manifolds while the valves are open.































I've been using 87-octane in my Prius exclusively and it runs very well.
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Old 07 Jul 2010, 09:27 am   #5 (permalink)
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As has been said, it's a misprint in the manual. Only run "regular" in your Prius. Running a higher octane level has been shown to reduce mpg and in some cases cause the trouble lights to come on.































The vent in the rear is to cool/warm the traction battery (large battery).
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