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Hey gang, I am shocked to see that since owning my 23 si, I am getting over 40mpg. I drive in sport mode all the time as it helps with the rev hang. I would say I drive 80 percent conservative and 20 percent throttle happy. Premium fuel only of course. How is everyone else doing ?

Hey gang Spoke with my Honda dealer and they say that the SI is totally fine with using regular 87 gas, won’t void warranty, and states no problems will occur. Would it hurt filling every other tank with 87 and 91 for cost savings ? Thoughts on 89? Here In Canada, 91 octane works out to around...