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the contact patch of the two tires u mentioned would be the same on the same car, with the same psi. how the tire reacts is where the difference is. eg, the 245 tire would be more stable because it is wider. There are lots of other factors. but Thats for a different thread. Now for your mpg statement. did you factor the different diameters of the tire into your mpg figures. if you dont adjust the figures the 175mm at 39mpg is probably the same as the 185mm at 35mpg
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