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General Chat Thread, Unleaded or Premium unleaded in General; Apart from the price difference, is there really any big difference between the two. There has been so much speculation, ...
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    sippo's Avatar
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    Unleaded or Premium unleaded

    Apart from the price difference, is there really any big difference between the two. There has been so much speculation, premium gives you more mpg and better performance?

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    DT2
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    Isn't premium 97 octane, where regular is 95.
    Hotter burn, cleaner engine.... apparently.

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    Filled up with the premium yesterday morning - used quarter of a tank to do a 40 mile trip home
    Normal uses about the same after roughly 100 miles?!

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    It's the octane rating in the fuel. Higher octane the bigger the bang and more power. They usually have some additives and special bits to try and justify the price. If it does any good, well you need to be the judge. Also some performace cars will only work on Premium or Super unleaded due to the engine mapping being written specifically for that fuel. If you don't use it, you get a really big BANG!!! Once!!

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    Premium I'm guessing will have a higher octane rating, the higher the rating the more advanced the ignition timing can be so may release a few more bhp, Depends largely on the engine and ecu of your car. Some really high performance engines with mega compression ratios need the premium stuff just to run smoothly. My Nova has a high compression engine, and the carbs and distributer are setup on higher octane fuel, if I put normal unleaded in it runsa like a dog. HTH.

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    it depends on the car really. We put it in once a month and do notice a bit of a difference, maybe 4 more MPG than normal fuel...

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    DT2
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    Nova.... I haven't seen one of those in years!!

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    I used the premium diesel once as it was the same price as standard due to the garage trying to empty the tank ready for the winter mixture. Didn't notice much difference, maybe a couple of points of MPG higher, though mine fluctuates a lot so can't really tell. Someone since told me you only notice once you have used a couple of tanks to ensure you are just using premium and that it has cleaned the engine. I call poppycock but not going to try.

    I seem to recall someone doing a full on test logging everything down for a year and found little or no difference. I'll see if I can find the results.

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    Higher octane rating helps to prevent pre-ignition of the fuel due to compression - knock. Modern cars will often be able to detect this and adjust accordingly, so will run on either fine. There's little point though, unless your car has a high compression ratio or is turbocharged. The owners manual will inform you better. An example would be the Japanese Celica GT-4 ST202 - 100 octance fuel gives an extra 20bhp on these. Put the same thing in an NA Focus or something, you'll see little or no difference.

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    i tried it last time i had a petrol car and iirc got WORSE mpg on vpower(i definately did with vpower derv) but it was a bit smoother (both petrol and derv) than standard fuel and the tesco premium stuff at the time the car just did not like at all it ran worse than on cheap 95ron sainsburys fuel.

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    Here is the WhatCar study which shows no great benefit

    & this site seems to have a good sum up about it. A good poin ti makes is you will probably get better results swapping brand then swapping to premium.

  12. Thanks to TechMonkey from:

    sippo (25th January 2012)

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    Quote Originally Posted by DT2 View Post
    Nova.... I haven't seen one of those in years!!
    Yep, spent far too much on it really. Looks like a 1.2 but has a 140+bhp 1.6 8v GTE engine in it

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    DT2
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    Quote Originally Posted by BenABF View Post
    Yep, spent far too much on it really. Looks like a 1.2 but has a 140+bhp 1.6 8v GTE engine in it
    That's a bit mental in a motor that weighs the same as a kingsize mars bar, and handles like a dog on lino.... I've seen some crazy mods to nova's, never got into it myself though.

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    Handles lovely with the correct weighted engine, polybushes and decent quality suspension. It's when you start going bigger that you get chronic tourque and understeer.

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    DT2
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    Quote Originally Posted by BenABF View Post
    Handles lovely with the correct weighted engine, polybushes and decent quality suspension. It's when you start going bigger that you get chronic tourque and understeer.
    I about to begin some mod work to a 1.4i 1996 civic.... Pulse width modulated HHO ram injection system.... exciting stuff I tell you....

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