The green car of today is the turbo-diesel. Now the current turbo- diesels don't rattle and don't puff smoke. They don't have a large amount of horsepower but they do have a large amount of torque and that really better suits the way that we drive.
And so politicians and upper-economic-class-persons can show that they are serious about concerns of global warming by buying the 2011 Mercedes-Benz E-350 BlueTEC tubo-diesel. Now this car is efficient for one reason of being a sedan rather than an SUV because an SUV is just pushing air. Then the car is efficient for the second reason of being a turbo-diesel and getting a fuel mileage of 22/33 MPG. The weight of the car is surprising at 234 pounds more than a standard E-350.
Another turbo-diesel is the 2011 VW Jetta TDI. And here the fuel mileage is 30/42 MPG.
Not convinced ? Well, peak torque of these tubo-diesel cars occurs at about 2500 RPM and that's an easy car to drive.