There is always something like $2000 premium on diesels, plus the diesel costs more so there is little economic advantage on the diesels and only under certain circumstances. A good, economical engine of similar capacity would render only slightly worse fuel economy.
Corolla or Civic with 1.8L gas engine could go 1000 km on a tank too.
Torque, sure, the diesels have more, but what is the net advantage and how significant this advantage is.