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Originally Posted by Hootie361
Ease up on the pedal? I know... stupid retort. Still, by not flooring it constantly I went from 19mpg to 22mpg city... 25mpg to 30mpg highway.
Originally Posted by Guernica
Question on octane: What are the regular and premium fuel octane ratings in America? In Australia they're like this:
Regular = 91 octane
Premium = 95 octane
Also, Premium = 98 octane (this one's the more readily available premium)
There is no ethanol in our petrol, though I have seem some ethanol blends introduced recently. Also my fuel cap ('96 318i) instructs not to use anything less than 95 octane.
I have a conspiracy theory that my "95 octane minimum" 318i runs perfectly well on 91 octane fuel, but that BMW in conjunction with evil oil empires have colluded to trick me into filling up with their overpriced premium fuels. I have read many times here that your fuel is 89 octane regular and 91 premium, and if this is true as it seems at face value, it would be evidence that my theory is right.
I have been testing my 318i on 91 octane for the past three tanks. So far there hasn't been any decrease in measured fuel economy and the car seems to run just as well in all other respects. I'd be happy to keep running it on 91.
Why are there minimum restrictions on the fuel octane to run in the car anyway?
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