In mid October the CBC ran a story about premium gasoline and how, for most cars it was a waste of money (http://goo.gl/G5qR4). They went so far as claiming that its use caused higher levels of pollution from the tailpipe than regular fuel. While I agree almost entirely with the statement that it is a waste of money if your car does not require premium I found the claims of excessive pollution to be dubious. I admit that I did not watch the TV program, however while looking at the website article the picture of the technical expert with his gas analyzer set off alarm bells for me.
I had some discussions with those in the know about auto emission testing and they confirmed my thoughts: that it is very unlikely that using premium fuel when the manufacturer does not recommend it is going to cause any noticeable increase in tailpipe emissions. The gas analyzer shown in the picture is a piece of equipment similar to one that we own at our shop and while it is highly precise it is not capable of reading the very low emission levels that modern vehicles put out with enough detail to make such a conclusion. Modern vehicles have very sophisticated electronics, sensors, computers and catalytic converters which control emission levels and the simple use of premium fuel verses regular fuel cannot be detected by this type of gas analyzer. My recommendations are: 1) Don’t worry about the pollution increases as they are negligible to none-existent. 2) If your manufacturer doesn’t recommend premium, save your money and use regular. 3) If you own a premium fuel recommended vehicle as I do you can run it on regular if the engine performs well and doesn’t knock and ping: mine works great.