Quote:
Originally Posted by clivem2
Yes....the high octanes are in Europe. 95 is standard with 97 / 98 / 99 being very available too, the exact rating depending on brand.
Edit...I just read that US 91 equates to European 97. That explains it.
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So 93 US octane is equal to 99 European I assume? Then it makes more sense now! So off European numbers, all members here are using the same high octane gas here in the US. But yes, lower octane gas will cause a loss of horsepower and engine knocking in extreme circumstances. If you can afford an M40i, don’t skimp on the gas. If you do, any throttle issues you truly deserve imo. I only use Shell premium whenever possible and no issues here in Comfort, fingers crossed.