Hey Alfa Enthusiasts! I'm still new to this community– we've owned our Alfa for 1 year now and we have 7 months of winter (if that's saying anything). I'm looking for recommendations on octane levels for our '74 Spider. The highest octane we have in Montana is 91... is it worth it to pour in octane booster? Or is it all a waste of money and I should be fine with the octane level of 87? We live at an altitude of 4,793' and we often drive in the mountains ranging 7,000' - 9,000'+. Any insight and help is greatly appreciated!