|
I use what-ever Octane rating it says on my gas cap, and alternate between 91 and 89 depending on my driving plans. Of course, being on the eastern seaboard, altitude isn't an issue. Everyday driving it's 91. Whatever station is close.
Long highway trips I'll save some coin and step down to 89. Been that way for multiple BMW's for years w/o any problems. YMMV
|