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I agree with what was said about better mileage from experience. I was driving the car in Spain and went from Madrid down to Cadiz. I filled up with Premuim before I left Madrid and got great mileage down to Cadiz. I filled up in Cadiz with the lower octane premium, don't know what octane because they use a different rating system in Europe, and got horrible mileage. If I remember correctly, I got about 40 miles more off the premium that the lower grade. I also get the highest octane possible in the US because I can hear an audible difference in the engine sound with good vs premium.
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