We also analyzed the passenger capacity where we found that the model which will start flight testing, the MC-21-300, has a capacity between the A320 and the A321. The closest aircraft in capacity and performance in the MC-21 lineup versus the competition would be the MC-21-200 and A320neo.
We have therefore decided to do our efficiency analysis between these variants.
The MC-21 has a wider fuselage than the A320. This is a positive as it allows passengers to pass each other in the aisle of the cabin.
The drawback of the wider fuselage is a bit higher aircraft drag.
Coupled with a lower wing aspect ratio, the lighter MC-21 cannot open a fuel consumption advantage over the A320neo, despite being a more modern design.