I'm guessing the FR-S has a lower overall average (24.2mpg) due to more track days. Out of curiosity, in the same type of driving situations, are you finding any differences in fuel economy between the FR-S and BRZ? Wondering how much the different tires might be affecting the fuel economy.
It's hard to be certain which factor makes the biggest difference, but the stickier aftermarket summer tires on our FR-S affects the MPG two ways: 1) they have a bit more rolling resistance all of the time; 2) the extra stick encourages more spirited driving even on days the car isn't at the track. These tires probably make the FR-S the leadfoot's choice among the two cars when the sign-out sheet gets passed around.
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