1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

98 Octane Fuel vs 95

Discussion in 'General Chat' started by baobab68, Jul 20, 2017.

  1. baobab68

    baobab68 Copenworld Member

    Joined:
    May 23, 2014
    Location:
    Sydney Australia
    Car(s):
    Toyota Echo, Copen 0.7L
    Tonight I had to put some 98 Octane fuel in my 659cc 2004 Copen (95 wasn't available where I was).

    Am I imagining it, or is the car totally different on 98??? The drive home was like being strapped to something else altogether!!

    I had a friend who always claimed that 98, although more pricey, actually ended up being more efficient and cheaper in the long run.

    Anyone who's done some actual stats care to confirm?
     
  2. Kev pye

    Kev pye Copenworld Newbie

    Joined:
    Dec 21, 2016
    Location:
    Leamington spa
    Car(s):
    Copen
    Hi a guy who I was working for raced performance cars said copens running on 98 octane would make a massive difference and he wasn't wrong because it's only a tiny engine and needed the best fuel
     
  3. Salieri

    Salieri Copenworld Veteran

    Joined:
    Jun 19, 2012
    Location:
    Germany
    Car(s):
    Pearlescent White Copen (1.3 K3-VE)
    The car is made to run on 91 octane, so even 95 is fine. Maybe its just subjectively.
    But with Daihatsu you can never know. My aunt had a L701 cuore and swore by "Aral" (german subsidiary of BP - they make pretty good fuel, maybe you have heard of "Ultimate 102") because otherwise the car would not run right.
     
  4. baobab68

    baobab68 Copenworld Member

    Joined:
    May 23, 2014
    Location:
    Sydney Australia
    Car(s):
    Toyota Echo, Copen 0.7L
    I'll run this tank of 98 down then go back to 95 for the next tank. It definitely "feels" better. More "get up and go"...it's actually brought out the inner "hoon" in me.

    I should probably calculate some mileage stats on each tank and see how it pans out. 95, and even more so 98, are quite expensive in Australia. How I wish it could use E10!!
     
  5. Salieri

    Salieri Copenworld Veteran

    Joined:
    Jun 19, 2012
    Location:
    Germany
    Car(s):
    Pearlescent White Copen (1.3 K3-VE)
    You still have 91 octane in Australia? We get 95 E10, 95 E5, 98, and at some stations even 100 or 102 octane :D
    I also had that feeling of getting going faster once when I filled up with Super Plus 98. But honestly, it could just have been the weather ;)
    Given that your driving habits are consistent, you could compare it week by week, using different brands and octane ratings. Could get interesting

    E10 might be cheaper (2 cents a liter in Germany), but you also need more of it, so it might not be worth the risk
     
  6. welz

    welz Copenworld Regular

    Joined:
    Jun 8, 2015
    Location:
    Leverkusen, Germany
    Car(s):
    copen 2003
    No matter what you're doing, the ecu does it..:D no more power or etc..fill it with nitro, but be careful with e10
     
    Last edited: Jul 22, 2017
  7. jez77

    jez77 Copenworld Regular

    Joined:
    Jan 16, 2015
    Location:
    Brisbane Australia
    Car(s):
    2003 Daihatsu Copen
    2000 Toyota RAV4
    I always run 98 in mine since that's what it was tuned on and it's not my daily driver so cost isn't an issue.
    If you are just commuting 91 would be fine as the knock sensor will detune it to suit. Since 98 is about a 25 cpl more than 91 it's the economical choice too.
    If your going for a spirited drive switch to 98

    Daihatsu says NO to E10 in OZ
     
  8. baobab68

    baobab68 Copenworld Member

    Joined:
    May 23, 2014
    Location:
    Sydney Australia
    Car(s):
    Toyota Echo, Copen 0.7L
    I don't see 91 very often, and even 95 is not at all stations. Tank is practically empty now so I'll capture some mileage stats.
     
  9. Number6

    Number6 Copenworld Veteran

    Joined:
    Apr 25, 2013
    Location:
    Dublin
    Car(s):
    2005 0.7L Copen
    What about dumping in some octane booster?
     
  10. BarnsleyRob

    BarnsleyRob Copenworld Veteran

    Joined:
    Feb 2, 2017
    Location:
    South Yorks
    Car(s):
    2009/59 silver Copen 1298 cc (now gone to a new home)
    Or nitrous :cool:
     
  11. Number6

    Number6 Copenworld Veteran

    Joined:
    Apr 25, 2013
    Location:
    Dublin
    Car(s):
    2005 0.7L Copen
    Illegal for street cars :-(
     
  12. welz

    welz Copenworld Regular

    Joined:
    Jun 8, 2015
    Location:
    Leverkusen, Germany
    Car(s):
    copen 2003

    Attached Files:

    Last edited: Jul 25, 2017
    Number6 and BarnsleyRob like this.
  13. baobab68

    baobab68 Copenworld Member

    Joined:
    May 23, 2014
    Location:
    Sydney Australia
    Car(s):
    Toyota Echo, Copen 0.7L
    I finished my tank of 98 and now making measurements of the 95. I can already tell just from the fuel gauge that the 98 got me more km to the litre, will post results when done.
     
    Salieri likes this.
  14. baobab68

    baobab68 Copenworld Member

    Joined:
    May 23, 2014
    Location:
    Sydney Australia
    Car(s):
    Toyota Echo, Copen 0.7L
    Final results. Not totally scientific but...

    I got 429km for a tank of 98
    438km for a tank of 95

    I worked out the 30.58litre tank of 98 was 14KM per litre

    The 27.62 litres of 95 got me about 15.8 KM per litre.

    So the 95 was more efficient. BUT the car didn't feel the same on the 95. I'll buy 98 when it's cheap here, and 95 otherwise.
     
    Salieri likes this.
  15. Khalid

    Khalid Copenworld Newbie

    Joined:
    Nov 13, 2016
    Location:
    Bradford, West Yorkshire
    Car(s):
    Daihatsu Sirion Rally II, Daihatsu Copen 1.3
    That's great work!

    I just find that 98 Octane does make the car feel a bit more perkier on my 1.3... It could be because my pocket is a bit lighter as its costs a bit more... Most of the time I use 95 Octane but every couple of weeks I'll put in 98 Octane for some spirited driving :-D
     
  16. freddyzdead

    freddyzdead Copenworld Regular

    Joined:
    Jan 5, 2017
    Location:
    Gosford, NSW, Australia
    Car(s):
    2003 Copen
    Oh, oh... I always used E10 in my Sirion, which I drove absolutely trouble-free for 8 years. When I got the Copen, I just kept on using E10. Now I find out you're not supposed to. Can someone tell me why? Does Daihatsu actually say "No"? Have I already wrecked the engine by using E10 in it for 8 months? I've never tried any other fuel, but it seems to go alright as is.
     
  17. jez77

    jez77 Copenworld Regular

    Joined:
    Jan 16, 2015
    Location:
    Brisbane Australia
    Car(s):
    2003 Daihatsu Copen
    2000 Toyota RAV4
    Diahatsu said no.
    Generally has something to do with rubbers or seals that degrade using E10 not that it will damage the motor so much.
    I'd avoid it as much as possible but its probably fine to use it if you have to from time to time.
     
  18. marnob

    marnob Copenworld Regular

    Joined:
    Aug 7, 2014
    Location:
    Gold Coast, Australia
    Car(s):
    Copen L880K 2004
    Copens don't use much fuel anyway? When I bought mine I immediately put 98 in it straight away.
    Its just better all round and any extra power you can squeeze from the small engine is a bonus isn't it?
     
  19. Salieri

    Salieri Copenworld Veteran

    Joined:
    Jun 19, 2012
    Location:
    Germany
    Car(s):
    Pearlescent White Copen (1.3 K3-VE)
    You can use E10 in your Copen if the VIN is this or higher: JDAL881K000004707 (production date: April 2008)

    So all the JB-DET engined Copen are not factory equipped to handle E10
     
  20. freddyzdead

    freddyzdead Copenworld Regular

    Joined:
    Jan 5, 2017
    Location:
    Gosford, NSW, Australia
    Car(s):
    2003 Copen
    I understand there are places in the world where there is no petrol fuel that does not have ethanol in it. Sometimes up to 25%. What would these people do?
     

Share This Page