Hybrids are efficient, and so are diesels. So what happens when you combine them?

While there have been diesel hybrids in the past (see: Mercedes-Benz), Hyundai wants to have a crack at it with the Tucson CRDI 48V. In fact, they're taking a two-pronged approach to the whole diesel-hybrid "revolution" by having two engine options for it.

First is a 2.0-liter version of the Tucson CRDI Hybrid. Specs are similar to the standard Tucson 2.0 CRDI with 185 PS and 400 Nm of torque. There are, however, big gains in fuel efficiency with the a European combined cycle rating (mix of city and highway driving) of almost 18 kilometers per liter. Hyundai also claims it can hit nearly 19 kilometers per liter in what's called the extra-urban cycle, which consists of mid-speed cruising plus short stop and go bursts.

Drive past filling stations with the Hyundai Tucson CRDI hybrid image

But if you want even more efficiency, there's the new 1.6 CRDI Hybrid. With its smaller engine size, this version of the electrically-assisted Tucson makes less power at 136 PS. For now, there are no official fuel economy ratings just yet. However, Hyundai did say that there is an 11% improvement in economy over the 2.0-liter version. If so, that means an extra-urban efficiency of about 21 kilometers per liter. Note that these figures are based on the European fuel economy standards. Highway fuel economy has yet to be rated.

The hybridized Tucsons are not plug-in models. Instead, these are mild-hybrid vehicles (MHV) meaning they cannot run on pure electric power alone. A mild-hybrid extends range, albeit not as much as dedicated hybrids or plug-in hybrids. MHVs helps fuel efficiency by relying on battery power while in stopped in traffic, under braking, or while coasting.

So while there's only minor assistance from the battery packs, both the 1.6-liter and 2.0-liter mild-hybrid Tucsons have a projected range of over 1,000 kilometers.