Coupe Vs Sedan

Either way, whether it’s two or four doors or a coupe or a sedan, these vehicles share similar characteristics. In the end, we’re looking at a difference of one seat. Really, you can’t go wrong with either car.
Coupe Vs Sedan >> 19" OEM Infiniti G37 Coupe vs. Infiniti G35 Sedan | 19x8.5 I… | Flickr

Coupe Vs Sedan >> 19" OEM Infiniti G37 Coupe vs. Infiniti G35 Sedan | 19x8.5 I… | Flickr

It is ALSO about if the LB diff between coupe and sedan on 335 is 22lbs, then if the M3 coupe has a carbon roof, then shouldn't the LB diff on M3 coupe vs sedan be GREATER than the LB diff on 335 (no carbon roof on coupe)?!
Coupe Vs Sedan >> 2017 Honda Civic Si Sedan Might be Rated at 32 MPG Combined - Motor Trend

Coupe Vs Sedan >> 2017 Honda Civic Si Sedan Might be Rated at 32 MPG Combined - Motor Trend