'12 Civic Si Fuel Question
  1. Welcome to 9th Gen Civic Forum : 2012 Honda Civic Forums - 9th Generation – General discussion forum for 9th Gen Civic

    Welcome to 9th Gen Civic Forum : 2012 Honda Civic Forums - 9th Generation - a website dedicated to all things 9th Gen Civic.

    You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, Join 9th Gen Civic today!
     
+ Reply to Thread
Results 1 to 4 of 4
Like Tree6Likes
  • 4 Post By kev604
  • 2 Post By mreggball

Thread: '12 Civic Si Fuel Question

  1. #1
    Greenhorn
    Join Date
    Aug 2017
    Posts
    1

    '12 Civic Si Fuel Question

    So i always went with 92/93+ but my buddys dad who is a master mechanic (not a honda mechanic) said i can run regular grade fuel and it won't damage my vehicle, so i tossed in a tank of regular. I seem to get a little less mileage but what concerns me is when I idle my car tends to shake harder than normal. Should I go back to running premium or is it safe to keep using regular? It saves me almost 30-50 cents a gallon... also, after shaking/knocking itll sometimes idle very quiet, like you cant even tell the engine is running
    Last edited by Dfraney; 08-14-2017 at 03:01 PM.

  2. Remove Advertisements
    9th Civic
    Advertisements
     

  3. #2
    I Need A Vacation kev604's Avatar
    Join Date
    Mar 2013
    Location
    Vancouver, Canada
    Posts
    13,117
    Go back to what Honda recommends and what it saids in your owner's manual which is at least 91octane. 87octane can cause engine knock which can damage your engine over time and will cost you alot more than what your saving now.

    Quote Originally Posted by Dfraney View Post
    So i always went with 92/93+ but my buddys dad who is a master mechanic (not a honda mechanic) said i can run regular grade fuel and it won't damage my vehicle, so i tossed in a tank of regular. I seem to get a little less mileage but what concerns me is when I idle my car tends to shake harder than normal. Should I go back to running premium or is it safe to keep using regular? It saves me almost 30-50 cents a gallon... also, after shaking/knocking itll sometimes idle very quiet, like you cant even tell the engine is running
    2013 Civic Si sedan PMM

    K24Z7 Crew Member #717
    9th Civic POP Crew #717

    Kev's Build Thread
    Hidden Content

  4. #3
    Platinum Member mreggball's Avatar
    Join Date
    Jan 2015
    Location
    Eastern PA
    Posts
    2,065
    Quote Originally Posted by Dfraney View Post
    So i always went with 92/93+ but my buddys dad who is a master mechanic (not a honda mechanic) said i can run regular grade fuel and it won't damage my vehicle, so i tossed in a tank of regular. I seem to get a little less mileage but what concerns me is when I idle my car tends to shake harder than normal. Should I go back to running premium or is it safe to keep using regular? It saves me almost 30-50 cents a gallon... also, after shaking/knocking itll sometimes idle very quiet, like you cant even tell the engine is running
    Honda doesn't tell you to use 91 octane because they feel like it. Is your friend's Dad willing to pay the repair bills when 87 eventually screws up your car? Sure, the car will run, but at what long term price?


    Sent from AutoGuide.com Free App
    Roadcourse and Squidward like this.
    POP CREW MEMBER #615

    Retired:

    2012 Civic Si sedan / Dyno Blue
    2014 Civic Si sedan / MSM
    2012 Civic Si sedan / Sunburst Orange
    2007 Civic Si sedan / Silver

    Hidden Content

  5. Remove Advertisements
    9th Civic
    Advertisements
     

  6. #4
    Big Pimping!!! dpetro1's Avatar
    Join Date
    Jun 2014
    Location
    Catonsville, MD
    Posts
    913
    Our motors have a high compression ratio of 11.0:1 from the factory. Stick with the premium fuel.

    Sent from my SM-G920V using Tapatalk

+ Reply to Thread

Quick Reply Quick Reply

Register Now

Please select your insurance company (Optional)

Similar Threads

  1. Fuel injection question
    By 15EXCoupe in forum Mechanical Problems & Technical Chat
    Replies: 1
    Last Post: 06-28-2015, 08:34 PM

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Powered by vBadvanced CMPS v4.1.2