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first the 3 banger idles higher than the 4. second you are comparing apples to oranges. the auto companys are taking the v8's and making v10's so that they make the same power with more mpg. the reason they dont make 1300 v8s with the same tricks of the xfi is cause of the cost. if we use ur reasoning the yamaha vstar (1300 v twin) gets 42, the 98 metro 3 banger gets 44. the ford festiva gets 44.4 and the honda cb 750 gets 45. so as the number of cylinders increase the milage goes up in that example.
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