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87 Octane Question

9K views 29 replies 18 participants last post by  xMDxWRX 
How can i test the Octane of the Fuel?
Here in Brazil the best fuel says that have 91 octane but i doubt it.
How can i confirm?
Would it be good to buy a lot of octane boosters and putting them every time you refuel??
Thanks
Tuca
 
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