Renault’s new M9R diesel engine does 40 MPG

Conventional thought tells us that diesel engines are loud, obnoxious, and pollute like mad. Renault wants to dispel that myth, developing — in partnership with Nissan — the eco-friendly diesel 2.0dCi (M9R) engine. This is the first unit that was jointly developed by the pair, and two versions have been developed: a smaller 150hp powerplant, as well as a beefier unit good for 175hp. Both engines are mated with a six-speed manual gearbox.

Not only are its CO2 emissions “among the lowest of their class”, this diesel engine is one of the more efficient choices out there with a “combined cycle fuel consumption of [just] 5.8 litres/100 kilometres.” That’s over 40 miles on the gallon for any Americans keeping score.