Fuel Type 91 or 95 for Corsa?
Question:
Having just purchased an SB BArina, I was doing what all good new owners do……reading the handbook.
I came across a mention about a Fuel Coding Plug allowing you to flick over from 91 octane to 95 octane fuel.
Now, apart from handing over more cash to the fuel companies, what is the benefit of switching to 95 R.O.N?
What exactly does the fuel Coding Plug do when you turn it over?
Answer:
In short, you will get 3% worse fuel consumption/power from E10 as ethanol has less power when it goes ‘bang’. Now, as Ethanol itself has a RON of about 109 to 112, the RON or octane of Caltex E10 is between 94 and 95 but Mr Caltex has decided to keep the label of E10 as 91 so people wont use it in place of 95+ that some car makers call for. The simplify mathematics of E10 is, 94 – 3% = 91, hence the label on the pump at Caltex stating E10 as 91. If you use 95 octane premium, you will get further on the same amount of petrol but you did pay more when you filled up so it might work out to be cost neutral. In short, if you have fuel injection, your car will run on anything from E10 through to 98 so use what you want or can afford but keep in mind that premium fuels do have cleaning agents in them so your car will thank you later if you use premium. Premium 95 is a good compromise but if your car is highly tuned or modified, use 98 premium. If your Corsa has a carburetor, use 95 as this is the closest to the old leaded super.
