2009 Volkswagen Jetta diesel
So far, Consumer Guide's test-car editors are averaging 38.8 mpg in the 2009 Volkswagen Jetta diesel.

As consumers seek better fuel economy in the wake of extremely volatile fuel prices, diesel-powered passenger cars seem poised to make a comeback on the American automotive scene. For 2009, Volkswagen brings "clean diesel" power that's emissions-legal in all 50 states to the compact-car segment with the Jetta TDI.

Jetta TDI is equipped similarly to the gasoline-powered Jetta SEL. As such, the TDI is one of the pricier, yet more upscale cars in the compact class. Our extended-use tester is a sedan with the 6-speed automatic transmission. We want to see how this diesel stacks up, not only for fuel economy, but also reliability, which has been a sore spot for recent Volkswagens.

So far, so good. We're impressed with the refinement of our TDI, and how seamlessly the diesel powertrain is integrated into the overall package. A bit of engine clatter at idle and while accelerating is the only real tip-off that a diesel is under the hood. Gone are the unpleasant exhaust odors and coarse vibrations of past diesel engines. Fine fit and finish, classy interior appointments, and impressive ride quality are other high points.

Long-Term Tests
Over the course of a year, our editors drive approximately 200 new cars and trucks. Most vehicles are evaluated over a two-week period; some are evaluated for six to 12 months. The vehicles we drive for this extended period of time are called Long-Term Testers.
The 140-horsepower turbodiesel has decent power and torque overall, but our main gripe is the powertrain's sluggish behavior during low-speed acceleration. The TDI's non-linear throttle response (a trait we've lamented in other VWs), slight turbo lag, and occasionally tardy transmission shifts can make moderate-speed passing maneuvers or pulling out into traffic from a stop a frustrating experience.

Our fuel-economy average of 38.8 mpg is nothing to sneeze at, though that number is tempered by the higher cost of diesel fuel. Given the current price premium for diesel over gasoline, out-of-pocket fuel expenses are basically a wash between a Jetta TDI and its gasoline-engine stablemates. However, if fuel prices skyrocket again, the TDI could offer significant savings, both at the pump and at purchase time, as this VW is eligible for a federal income-tax credit.

The Vehicle
Body Style: 4-door sedan
Model: TDI Loyal Edition
Engine: 140-horsepower 2.0-liter turbodiesel 4-cylinder
Transmission: 6-speed automatic
Base Price: $22,440
Major Options: 6-speed automatic transmission
Price As Tested: $24,190
Total Measured Miles: 22,112 miles
Consumer Guide Observed Fuel Economy: 38.8 mpg
Problems During Test: None

Editors' Comments
Tom Appel: Our Jetta TDI is returning fuel economy on the order of 40-percent better than a gas-powered model. Even if diesel costs more where you live, it's hard not to see the value here. The DSG transmission can be cranky, and is easily fooled in around-town driving, but is a joy to feel work when you push the car harder. If you're seriously thinking diesel, test drive a TDI.
Damon Bell: If you have bad memories of clattery, smelly diesel passenger cars from the past, forget about them... the 2009 Jetta TDI is one of a new breed of modern diesels that are much cleaner and much quieter than before. To my ears, our Jetta TDI is barely noisier than its gasoline-engine counterpart, and my nose has caught scarcely a whiff of any unpleasant diesel fumes. Meanwhile, I'm averaging well over 30 mpg and enjoying this car's torquey, confident acceleration. The DSG transmission is balky at times, and the diesel fuel retailers in our area are a bit grungier than the average gas station, which can make refueling a potentially messy procedure. Still, it's hard not to like this car.
John Biel: Diesel fuel efficiency with decent performance, plus a fairly roomy and nicely appointed interior make the Jetta TDI a car worthy of serious consideration for shoppers in the class. Too bad VW's customer-satisfaction scores suffer, perhaps taking some of the luster off of a car that could be very right for the times.
Jennifer Geiger: Jetta's DSG transmission takes some getting used to, as does the turbo lag. Overall, it's comfortable, composed, and relatively affordable. This TDI offers an alternative-fuel alternative to Honda's Civic Hybrid in the compact class. While you'll (barely) notice you are driving a diesel, the fuel economy gains more than compensate for a bit of clatter at idle and an overall coarse sounding engine note...now if only the price of diesel fuel would drop.
Ed Piotrowski: To rehash a tired phrase--this isn't your father's diesel. The 2009 Jetta TDI is quiet, refined, and efficient. If it's anything like other German diesel vehicles, it should also prove solidly reliable. The price of entry is high, but the experience is well worth it.
Jack Stewart: Jetta TDI is a painless way to save on fuel. It is fun to drive and has a well-finished interior.

10.27.2009