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

Reply
 
LinkBack Thread Tools Display Modes
Old 07 Jul 2010, 10:00 am   #1 (permalink)
Junior Member
  • Join Date: May 2010
  • Posts: 9
  • User Status: Offline


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.
  Reply With Quote
Old 07 Jul 2010, 10:04 am   #2 (permalink)
Senior Member
  • Join Date: Feb 2010
  • Posts: 136
  • User Status: Offline


Default

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.
  Reply With Quote
Old 07 Jul 2010, 10:06 am   #3 (permalink)
Senior Member
  • Join Date: Feb 2010
  • Posts: 347
  • User Status: Offline


Default

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.
  Reply With Quote
Old 07 Jul 2010, 10:10 am   #4 (permalink)
Senior Member
  • Join Date: May 2010
  • Posts: 197
  • User Status: Offline


Default

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.
  Reply With Quote
Old 07 Jul 2010, 10:27 am   #5 (permalink)
Senior Member
  • Join Date: May 2010
  • Posts: 783
  • User Status: Offline


Default

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).
  Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 09:59 am.

Attribution:
Autoblog
Powered by Yahoo Answers



ToyotaLexusForum.com is an unofficial community for car enthusiasts. ToyotaLexusForum.com is not affiliated with Toyota Motor Corporation in any way.
Toyota Motor Corporation does not sponsor, support, or endorse ToyotaLexusForum.com in any way.
Copyright/trademark/sales mark infringements are not intended or implied.