Looking for a good deal on a used diesel car?

Turns out Buffalo is the best place to go, according to new data from iSeeCars.com. The home of chicken wings and the Bills football team is the least-expensive city in which to buy a used diesel, with prices 6.0 percent below the national average.

The combined Providence, Rhode Island-New Bedford, Massachusetts metro area came second, with used diesel prices there 5.1 percent below the national average. The Tampa-St. Petersburg, Florida metro area was third, with prices 5.0 percent below the national average.

In contrast, Seattle was the most expensive city to buy a used diesel car. Prices in the Emerald City were 7.1 percent above the national average. It was followed by Indianapolis (4.1 percent) and Baltimore (3.5 percent).

Used diesel cars tend to be more expensive in areas--such as the West Coast--where green cars are already in demand, iSeeCars.com CEO Phong Ly said.

He noted that cities with the priciest secondhand diesels also tend to have higher overall used-car fuel economy.

2014 Audi Q5 TDI, Catskill Mountains, Oct 2013

2014 Audi Q5 TDI, Catskill Mountains, Oct 2013

Seattle had the fifth-highest fuel economy among used cars in another iSeeCars study, with 7.2 percent of used vehicles in the city rated at 30 mpg or higher.

Los Angeles was rated the fifth most expensive city to buy a used diesel car--prices were 1.9 percent above the national average--and the second-highest fuel economy among used cars, with 8.8 percent rated at 30 mpg or higher.

Diesel's biggest benefit for customers is consistent fuel efficiency. Many diesels surpass their EPA highway ratings in real-world driving.

The two strongest proponents of diesel have been corporate siblings Audi and Volkswagen. Audi recently expanded its fleet with A6, A7, A8L, and Q5 TDI models, and believes diesels are the future for luxury sports sedans.

In the meantime, the best place to look for a used diesel may be where compression-ignition cars are least wanted.

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