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Consumer Reports got 23 city, 37 hwy in their 6MT FR-S. Their 6MT Mustang V6 got 16 and 35. Highway gas mileage is a function of specific fuel consumption at a given rpm, gearing, and aero drag (drag coefficient, frontal area). Weight has very little to do with highway fuel economy (that which is in motion tends to stay in motion). Weight plays a huge role in city driving, though. That is likely why the FR-S averages such good real world fuel economy. It doesn't take the beating most cars do when it comes to stop and go, which we all see some.
Plus, in the EPA test, MT cars have to shift to a certain RPM whether they need to or not; the test dictates it. Aggressively geared cars are going to be revving higher than they probably need to in order to match the dictated vehicle speed curve.
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