Hyundai appears to be phasing out their diesel models in favor of HEVs due to tightening EU diesel regulations and the higher cost of meeting them:
Hyundai debuts new hybrid transmission in Ioniq EV...Hyundai says the new hybrid transmission could allow it to stop selling diesel engines in the future. Hyundai is under intense pressure to meet upcoming European Union emissions standards. In order to get its diesel engines to satisfy regulators, it will need to fit them with a urea injection system at a cost of about $1,500 per car.
That extra cost is what led Volkswagen astray. It struggled to meet emissions standards without installing urea injection systems. When it couldn’t, it installed software designed to fool regulators. That decision may cost Volkswagen billions in fines and legal liabilities to consumers who bought non-conforming cars from Volkswagen.
“A modern diesel engine is already $3000 [at factory cost] more expensive than an equivalent petrol engine. Our engineers think it will cost another $1500 to add the Urea injection system. This additional $4500 cost is very similar to the extra cost of our new hybrid system,” Yang says.
The Ioniq with its new hybrid powertrain is already cleaner than a diesel with the latest urea injection system. If the two powertrains cost the same to manufacture, Hyundai will elect to use the hybrid package instead of building more diesel powered cars. It will take about 4 years for the company to redesign its other front wheel drive cars to use the hybrid system used in the Ioniq...