When talk turns to hybrids, the argument for a diesel engine rather than hybrid power is often raised. Modern diesel engines are capable of fuel economy near or better than some gasoline hybrid cars on the market.

It would seem that the ultimate hybrid system would be a combination of a diesel engine and an electric motor. This is exactly what Citroen has plans on making. Citroen introduced the C-Cactus concept car in 2007 featuring an odd design and a diesel/electric hybrid powertrain.

Citroen announced this month that it intends to produce a version of the C-Cactus concept car. The hybrid powertrain isn’t the only thing green about the vehicle. Citroen has greatly reduced the number of components needed to make the vehicle, slashing construction costs and environmental impact from the manufacturing process.

The production version of the C-Cactus will use the HYmotion2 hybrid system featuring a 1-liter diesel engine paired with an electric motor. The French automaker says that the hybrid system could provide up to 100 miles per gallon.

Another option for the production car is an all-electric version that would have a goal of achieving 100 miles of driving range at a 70 MPH top speed. Images of the C-Cactus are from the concept car, and as such, you can bet that the design and interior will be toned down significantly.

One thing you can count on for sure is that the car will never see roads in the United States. The Citroen brand is not sold in America.

If Citroen can hit that 100 MPG  number, it will be impressive. The Honda Insight is one of the most fuel frugal cars American's will be able to purchase in the coming years.