Quote:
Originally Posted by juliog
NC: 21/28 MPG (6MT)
FR-S/BRZ: 22/30 MPG (6MT)
Mazda 3: 29/40 MPG (2.0L MT)
Since the ND will be using the Mazda 3's engine and is ~500lbs lighter:
ND: 30+/40+ MPG (2.0L MT) 
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The lower curb weight will improve fuel economy. The engine being mated to RWD and tuned for output and throttle response will hinder it.