2009 Volkswagen Jetta TDI Sedan

Clean, green and so much fun

By Nina Russin

2009 Volkswagen Jetta Sedan

Diesel technology has evolved significantly over the past two decades. The new generation of clean diesel cars are fuel-efficient, environmentally-friendly, nimble performers. Last year, the Volkswagen Jetta TDI SportWagen won our ALV green car of the year award. This week, I had the chance to drive the wagon’s four-door sibling: the Jetta TDI sedan.

The secret to diesel performance is its low-end torque. The Jetta TDI develops peak torque of 236 foot-pounds at 1750 rpm: just above idle. As a result, the car can accelerate extremely hard from a stop.

Common-rail technology and on-board computer controls have eliminated the lag that plagued older diesel cars. Throttle response on the Jetta TDI is virtually indistinguishable from its gas-powered counterpart.

Diesels emit less carbon dioxide than gas cars: carbon dioxide is a greenhouse gas thought to be a major factor is global warming.

But here’s the best part: diesel cars yield between 25 and 30 percent better fuel economy than equivalent gasoline models. The fuel economy improvement is applicable to both city and highway driving. And unlike hybrids, the buyer doesn’t pay extra for the technology. Read the rest of this entry »