Really disappointed with my '12 Civic Coupe - Page 10
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Thread: Really disappointed with my '12 Civic Coupe

  1. #91
    Truck? What truck?! scottyrocks's Avatar
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    Quote Originally Posted by Slickone View Post
    I wouldn't normally bump a 2 month old thread, but thought it would be useful to some to know that the website Ethanol-free gas stations in the U.S. and Canada will tell you where ethanol-free gas stations are (US and Canada).

    Also, does anyone know more about what scottyrocks mentions, as far as the Civic (R18) being designed to run on 91 octane? If not, generally using a higher octane than the engine is tuned for could give you lower gas mileage, and I've heard foul the plugs, or else at least just be a waste of money.
    Silver is really the expert on this. He has a thorough understanding and knowledge, and the ability to express it clearly. He has written about this in a few threads that I, of course, can't find right now. =o\
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  3. #92
    Question Authority Roadcourse's Avatar
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    Quote Originally Posted by RobSBP View Post
    Ex model have bigger heavier rims than LX. 29mpg average is about right. Just get lightweight rims and tires, the mpg will be a lot better.


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    This is a ridiculous statement. My EX with 33K miles has never gotten this low an average either on the highway, city or combined. It has over 33mpg on it right now all of it city driving. It isn't hard to do so you either have a car problem or a driver problem. Do some problem solving.
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  4. #93
    Question Authority Roadcourse's Avatar
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    Quote Originally Posted by scottyrocks View Post
    Unless I am completely mistaken, this is exactly what Honda did. They engineered the Civics to run on 91, and then tuned the ecu to accept 87. At least this is what I understood from Silver.

    If I did misunderstand, please jump in here and straighten me out, thanks.
    My Civic runs very well on regular and very slightly better on premium. Once the current tank of premium is gone it's back to regular. The math doesn't work at all for me.
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  6. #94
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    Fuel Octane, Choosing The Wrong Octane Will Cost You | What Could Be Greener
    What will happen if I use higher octane gas than I’m supposed to?
    A few things. For one, you will be wasting a huge amount of money paying for high octane gasoline. Second, your car will not run correctly, whether you notice it or not. Higher octane fuel requires more heat and more precision to burn correctly. If your car is designed to burn 87, it will not burn 93 correctly. Third, your gas mileage will suffer. The inability of your engine to burn the higher octane gas correctly will cause your engine to produce less power and thus will require more fuel to perform at the same level.
    Carbon buildup and octane rating | Mechanical /Maintenance Forum | Bob Is The Oil Guy
    People here talk about using higher than rated octane causing carbon build up.
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  7. #95
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    Quote Originally Posted by Slickone View Post
    Great link^^^^^^^
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  8. #96
    One Bad Mama Jama!!!
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    Quote Originally Posted by Jamis View Post
    At least Honda didn't do what Chevy did with the Cruze. They designed the 1.4LT engine to run on 91 octane and then altered the ECM programming so it would run on 87 octane. Then they sold the car as requiring 87 octane. I guess they realized that they would have a tough time peddling a compact car that required premium gas. Unfortunately, at ambient temps above 90 F, the system has to shut off the A/C to have enough power to accelerate and to sit at a stop light without overheating.
    Two sides to every story on the Cruze, just spoke to engineering and their reply:

    The 1.4L Turbo has always been calibrated to run 87 octane since the start. It has only a small boost to get typical performance of a larger 4-banger. Considering the Regal GS’s 2.0L can put out 260HP, wouldn’t you think 1.4L turbo can do a little more if it was tuned more aggressively with 91 octane???

    I don’t know what’s happening to the AC, but if it’s an ECO model, maybe it’s doing what it’s supposed to do: slow down AC, not turn off completely.


    I know many vehicles shut down AC when temps are high to prevent engine damage, or when the accelerator is floored demanding peak acceleration

  9. #97
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    With my Si, running 93 octane and all my mods, I get about 25-28 mpg mixed city highway. Most roads are about 35-45 mph with stoplights.

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  10. #98
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    Dealerships are basically stealerships and hate doing warranty. Take it to a known-good-honest-competent Honda mech and have him check things or do it yourself if you have the data and knowledge.
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  11. #99
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    That's actually a terrible link. That article is mostly incorrect/outdated. Couldn't find a date when it was written.

  12. #100
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    Quote Originally Posted by 4thCivic View Post
    Dealerships are basically stealerships and hate doing warranty. Take it to a known-good-honest-competent Honda mech and have him check things or do it yourself if you have the data and knowledge.
    I work at a stealership lol and I know for a fact the service department lovesss warranty work


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