2014 Mitsubishi Mirage ESOver the next several months I'll be testing different octane ratings to determine which is better for over all fuel mileage. I understand that our cars are rated to use 87 octane. However, it has been my experience in the past that cars, like ours, with moderate to higher compression ratios actually do get better fuel economy with higher octane fuel, especially in warmer environments. The big question is if the mileage increase is high enough to warrant the extra cost of the higher octane fuel. I plan to find out.
So, I'll try 3 tanks of 93 octane, then 3 tanks of 89 octane, then 3 tanks of 87 octane to see which one does the best.
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