R56 So do you all use Premium gas ALL the time?
#51
#52
If you had lived somewhere that actually has a winter season, you would be able to run a lower octane during that time because the air is cold enough to support it.
The Cooper has a pretty decent compression ratio, so I wouldn't run anything less than the mid grade where you live.
If at all possible, you should run a Top Tier gas...
http://www.toptiergas.com/
The Cooper has a pretty decent compression ratio, so I wouldn't run anything less than the mid grade where you live.
http://www.toptiergas.com/
#53
#55
I'd be careful about that. There have been a few MINI owners who have had fuel system problems from using gas with too much ethanol in it. I suggest reading what the owners manual says is ok & sticking with that. I don't remember off hand how much ethanol is ok.
http://www.michiganmini.org/forum/in...p?topic=2945.0
http://www.michiganmini.org/forum/in...p?topic=2945.0
#56
My '03 Cooper seems to run a bit better on 89 octane mid-grade than on premium. Also, I see no reason why 87 octane would be a problem. If the mileage is lower, (and it may not be), it's likely to be less than the amount needed to make up for the cost difference between regular and premium.
#59
#60
#61
I think some of the octane enhancers they use can cause this, I've heard a few others talk about the same problem. Just because it cost more and they call it "premium" doesn't mean it's always better.
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