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TimTiger
You are right of course. I forgot to look at the country of origin of the question. Here in the states we take two ways of measuring octane of a particular grade of gas then divide the sum by two for the octane posted at the pumps.
All are now unleaded, regardless of it's octane, typically 87/89/93 octane here in Arizona, USA..
Our 05 Tigers are able to run on the 87 octane all other things being equal.
In my younger years we hotrodded V-8's and anything with a compression ratio approaching that of the Tiger's required the higher octane to avoid knocking. Technology has come a long ways with more accurate ignitions and better head designs not to mention cooling systems.
This is what I was basing my remark on. Like oils, there are a lot of missconceptions about octane including the one that says that there is more energy in a drop of higher octane than in a drop of lower octane gas.
The pros of running the higher octane fuel are that it may help prevent knocking caused by "compression ignition". This occurence could be a warning of a mechanical problem in an engine designed to run on low octane fuel.
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Tim S
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