Quote:
Originally Posted by TOMKRILL
I have a 2004 Speedmaster and had the same question 2 years ago. You can run regular gas. You don't need premium, it is a waste of money, mainly because your compression ratio is like 8.5 to 1, but check your owners manual to make sure, 'cause I don't think you indicated what Triumph you are riding.
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The 2007 Speedmaster (865cc engine) owner manual states that it is designed to run on unleaded gasoline with an octane rating of 89 or higher. In most areas of North America, 89 gasoline is mid-grade.
