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This shows that engine size really makes the difference. I have an 1.2L Aveo that makes 53 MPG, without any modd (except removing the radio antenna, and over-inflate the tires from the recomended 2,3 to 2,5 BAR).
Don't know if the gasoline RON also makes a big difference. For example, here in Portugal we only have 95 and 98 RON. From what I know, in the US there is from 85 to 91 RON. I've been told that the more RON the gasoline has, the more efficient it is. So it's supposed to give a better mileage.
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