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  1. #1
    Moderator 86berlina's Avatar
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    Default Premium Unleaded vs Regular Unleaded

    Premium Unleaded vs Regular Unleaded.

    Regular unleaded "91 ron"

    Premium unleaded "98 ron"

    OK people what fuel do you use and what are the pros and cons.

    I ran both in a vy ecotec for aprox 1000k's each and used the trip computer to calculate the results on general city driving. ( to work and back ect. )
    Power to me didnt feel any diffrent except off the line it felt a little more punchy. Bearing in mind its a bog stock V6 ecotec.
    I have heard stories off dudes running premium all of a sudden being able to light up the rear tyres at will but it didnt work for me

    Ecomony though was a little better.
    Regular unleaded 12.1 L/100 ($1.11/L)
    Premium unleaded 11.4 L/100 ($1.20/L)

    Over all when I did the calculations it didnt really make much diffrence to running costs because on premium it got around 6% better economy but cost around 8% more.

    Cheers

  2. #2
    casual poster Chester's Avatar
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    Default Re: Premium Unleaded vs Regular Unleaded

    Quote Originally Posted by 86berlina
    I have heard stories off dudes running premium all of a sudden being able to light up the rear tyres at will but it didnt work for me

    Over all when I did the calculations it didnt really make much diffrence to running costs because on premium it got around 6% better economy but cost around 8% more.
    I'd come up with similar calculations. I worked out that it wasn't costing me any more to run premium so thats the only fuel I use.

    As for performance - in my old VL I thought that it made a huge difference. But I suppose maybe thats what I wanted to believe.

  3. #3
    Moderator 86berlina's Avatar
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    Default

    Yep gonna start a test on the old VL starting from next time I fill up.

    Use to use consistantly 13.5 - 14.0 L/100

    Will post results after 3 tanks full to see if there is an improvement.

    Cheers

  4. #4
    Your friendly admin mark's Avatar
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    Default

    i only run it in my VN.
    my car pings under load with any other fuel.

    but in my vl it was slightly more responsive.

  5. #5
    ADMINISTRATOR evil_ss's Avatar
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    remember 98 ron is bp ultimate not premium as that is 95 ron.My car is tuned for pulp and i noticed a very slight diff in responsivness. But ef all so a car that isnt actually tuned for premium shouldnt make much if any difference.Im running 98 atm so the tune can be changed for that ill post the dyno results when done.
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  6. #6
    casual poster SLENut's Avatar
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    Default

    My old SLE love gulping PULP.It runs very well on that but as sonn as ULP is its shes a bitch to run.And i haven't made the car modifide in any area at all.
    Nothing sounds nice like a V8 reving hard!

  7. #7
    Moderator 86berlina's Avatar
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    Yep your correct dude. My mistake
    I used BP Ultimate 98 ron not Premium 95 ron.

    Here in SA we got BP ultimate 98 ron and Modil synergy.
    Shell sells a premium 95 ron here in SA but Shell optimax is not available here. :?

    Was Checking out another forum today and Came across this.

    I heard from someone that if you put a mothball in the tank then that will increase the octane level by heaps but don't use more then one because it can do some serious damage. true or not? I heard it from a reliable source.
    Hehehe

  8. #8
    ADMINISTRATOR evil_ss's Avatar
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    I heard from someone that if you put a mothball in the tank then that will increase the octane level by heaps but don't use more then one because it can do some serious damage. true or not? I heard it from a reliable source.

    bah ha ha now ive heard everything!.I heard if you add salt and vinegar chips to your tank ina 304 youll get at least 20 hp increase, but if you put another flavour of chip youll lose 20hp! lol lol.Hy you never know
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  9. #9
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    It all depends on the tune of your car/Ecu your compression cam size duration etc each and all of these come into factor when selecting the right go juice the average stock 6 will use regular and be happy if u go 95 Ron u will get slightly better fuel economy as less fuel is required for the same size explosion but as far as 98 goes you wont notice the difference in a standard tune cause it wont be squirting the fuel to suit, the higher your compression the higher the octane you need to prevent detonation or "pinging" but some people believe that they had a stage 2 cam and a closed chamber head that they should run c14...whihc is too rich and will usually result in less performance .my car is a 304 Vl 5spd with vs heads and injection with magna 600cc injectors large long duration camshaft zero decked block haltech ecu dyno tuned for 98 grade anythign less and it wont wanna play ball it idles at 1000-1200 (and is lumpy at that) depending on the temp etc. and goes pretty damn fast although i dont thrash it it does hook up real quick and can hit the 200 on the speedo in 3rd gear. so you can see an engine like this doesnt liek to be run on cheap juice.to put into a perspective people drink coke and all it tastes great but water is better for hydration, race fuels can be considered gatorade!
    well thats my first blurb over and outtttttttt

    (ron is the austrlian standard for measuring octane there is also WON and theres a third i believe i cant remember the scale)

  10. #10
    Do you ever leave? stroker355's Avatar
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    Ive been lead to believe that high octane is better if youve got high comp and its on the verge of pinging than yes, but for stock compression engines a higher octane fuel will give them a bit LESS power, so horses for coarses.

  11. #11
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    yeah, compression and timing are the main components leading to any benifit gotten from PULP, if your set up/tuned for ULP your waisting money on anything better.

  12. #12
    460ci ought to do it Cougar's Avatar
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    Default

    I've found no difference in my XR8 between 98, 95 or 91 octane, so I just use the 91.

  13. #13
    Slippery when dry ;-) mrprem's Avatar
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    An engine runs best on the MINUMUM octane it can handle. The higher the octane, the slower the burn rate of the fuel, so generally it's a waste of money to put premium in a car that runs well on standard unleaded. 5.0 litre Commodores (VN onwards) for example only have 8.5:1 comp so premium shouldn't help performance. Having said that, sometimes the premium fuels DO help performance and economy because of the additives in them and they are a better quality fuel, but not really because of the octane rating.

  14. #14
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    Quote Originally Posted by Cougar
    I've found no difference in my XR8 between 98, 95 or 91 octane, so I just use the 91.
    Same in the gen3 statesman, and we monitor fuel in that thing all the time.
    Although i did accidently put 98 in my VS's tank and got a **** load of extra k's out of it..... like extra 100+ so i dont know.
    Fishing, Meat Pies, Bundy Rum & Holden Cars

  15. #15
    OMR346 pumba's Avatar
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    all i ever use is BP ultimate 98ron... my SS has been tuned for it when it had the kalmaker tuned, and even before then, thats all i have used. i get more kms out of it and the motor seems to run better. i refuse to use shell fuels as i have seen what they can do to motors... not good lol
    Quote Originally Posted by cbkey View Post
    negative bunch...you never see me saying anything negative..

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