“RJ, trouble is the 175 performance from SOU is sadly lacking, to be kind about it. It's going to struggle to get as far as the Dash with a similar load!”
Pretty much what Lord Spandex was getting at.
I think we can all do the sums until we are blue in the face the facts seem to be that the 175 offers nothing over the dash and As Adfly mentioned, a lot of flybe's bases (and importantly the ones they have little or no competition at) have short runways. So the question remains, why have they bought the damb things with those engines?
How much greener is the dash over the 175 on a typical route?