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Intersting, how much hp does 323i has? The 325i has 215 hp, I wonder if the reduced horsepower really make that much of a difference in fuel savings? Although if I do around 12.2l/100 km, that may not be that much.
Don't know how much switching to 17 inch will worsen fuel consumption, maybe it's better to compare it with how much better performance and handling you can get from it and balance that the fuel consumption.
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