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#11
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The reason guzzla has never noticed any difference between brands is because there isn't any difference between brands. (Well, none that you can pick this side of professional-grade test gear, and probably none worth mentioning then either.)
But there is, of course, a difference betweenb different types of petrol. Premium fuel Shell Ultra (just as one example, there are equivilents in all the other brands) will take you measurably further on a tank, and makes most modern cars a litle more nippy. The performance difference is very small and hard to measure, but the economy difference is quite significant and very easy to measure. 98RON like Ultra consistently takes you further on each tankful. Of course, it costs more too, so you have to trade off the cost against the benefit. You can't give a hard and fast rule like "95 RON is the overall best for economy" because the price difference changes all the time. One day the 98 octane will be the best buy (costs a bit more but takes you further), the next weekprices change and you are best to get the cheapest E10 ethanol blend 'cause it's quite a lot cheaper than standard 91 and you get more miles per dollar. So:
In a perfect world, you would have careful measurements and a smartphone app to tell you that E10 at $1.29 is cheaper per mile than 95RON at $1.36 but 98 RON at $1.39 is betterthnan either (just example numbers, don't quote me on those). But in the real orld, you just look at the prices and make your best educated guess. Rules of thumb:
Me, I like to use E10 wherever I can for envionmental reasons, but I'm damned if I'll pay overs for it, and you can't get it everywhere, so I wind up using E10 a lot, but also 98 or 91, and sometimes even 95 if the price is right.
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tannin.net.au |
#12
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I think they use MON, not RON. Knowing the MON is more important than knowing the RON.
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SG turbo, 99 WRX, PX2 Ranger |
#13
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Unfortunately it's not as simple as what has been explained either when it comes to 98 octane fuel it also has to be fresh, if you buy 98 octane from a low turn over station you are wasting your money as it goes stale quickly also if you don't go through a tank a week 98 octane is a waste of money. For example in Brisbane all guys who raced on weekends would fill up at one station, the station they knew always had the freshest fuel. This is a fact, not speculation don't use 98 octane unless you do the kilometres, 95 will be fine. When I am around town I use 95, when I am doing long trips I use 98. It's a bit like cooper tyres, they are good for 80000km if you do that in a few years great, but if you only do 10000km a year the tyre will have gone off before it wears out
One of the reasons it has taken so long for Australia to catch up with diesel cars is because our quality of diesel is horrible and it needed to be fixed up a bit to handle European motors as they would clog very quickly. As for E10 make sure your car can take it, if you have anything other than a designated ethanol tolerant car, call the dealer to make sure it's ok. For example VY commodores are a no no for E10, it eats the fuel pumps.
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RX Liberty 03 XT Forester (I love my turbo) |
#14
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MY07 Forester XT 5 speed, MY13 Golf 90TSI 6 speed |
#15
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I have also stumbled across a product quite a few years ago now called fuel doctor. When I first tried it I had a 95 VW Transporter diesel, it had about 180000km on the clock and was not doing so well on fuel consumption at this stage (I was a courier in Brisbane at this time) I was getting around 15-16 litres per 100km at the time. As I did around 1500km per week the results were very noticeable, within the first week my consumption went to 10 litres per 100km whether I was loaded or not and even better on long highway hauls. It is meant to clean the injectors while you drive and will eliminate water from your tank, if you have a diesel it will eliminate any chance of diesel bug plus it is meant to de-coke your engine slowly without having chunks fall off. I always use it petrol or diesel and if I get caught without the ability to get premium unleaded, this will boost the performance of 91ron. I use it and swear by it.
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RX Liberty 03 XT Forester (I love my turbo) |
#16
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I used 98 for my first tank and E10 for my second and third tanks. I got better economy for the two E10 tanks (by about 20%) but the Check Engine light has been coming on in the mornings - goes away after about a minute of driving.
I'm going to try two tanks of 98 and see what happens to the Engine light. I have a feeling that the E10 is the cause from reading other forums on ethanol based fuel. |
#17
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Then again - it could be the ECU was reset when I was installing the stereo and unplugged the batter a couple of times...
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#18
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Plus they tested it on a Brumby! ![]() Go to Fuel Doctor, then "tech talk" then click "more" under "Is Fuel Doctor economical?"... their own Brumby bought in 1992 & now at 196,750kms ![]()
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SUBIELIFTOZ, QUALITY LIFT KITS FOR SUBARUS 1" & 2" lift kits; custom lift kits; all models Last edited by NachaLuva; 13th February 2013 at 05:27 AM. |
#19
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If I remeber correctly, there are only three real "brands" of gasoline coming out of three different companies refiners. From there chemicals are added to get the product that each fuel company brands. Hess, Exxon, Chevron and Volero I know make it for themselves, I dont know about the others. Wikipedia has a list. List of additves http://en.wikipedia.org/wiki/List_of_gasoline_additives About 7 years ago the auto MFG's got together and threatened to set a std for fuel quality in the US as cheap fuels were starting to damage fuel injectors and causing warrenty issues. They were going to certify some brands and not others. that caused the Gas brands to clean up their acts. Interesting Read http://www.petrostrategies.org/Learn...ry_players.htm Dont knock the additives, some are much better then others. Also too much of one additive may give your car heartburn. Cheap brands dont really care where they buy it from so there may be no consistancy in the blend. They also get "spoiled" batches, where the fuel meets federal regulation but may not meet the brand names requirements for the blend. Also bad fuels do get through, and a common one is fuel with too much sulfur. This can screw up fuel senders or worse. |
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