Audi A8 L TDI offers real-world fuel economy -

Big luxury cars are great. But big luxury cars often come with other big things—big weight, big engines, and quite a thirst for fuel. This is starting to change, however, as more of these large luxury cars begin to feature alternative-fuel powertrains like the long-wheelbase 2015 Audi A8 L TDI and its turbocharged diesel V-6 engine. A standard Audi A8 L with the supercharged 3. 0-liter V-6 engine is rated at 19/29/22 mpg city/highway/combined. Splurge for the slick W-12 engine and you’ll get only 14/22/17 mpg. But tick the diesel box and your big, comfy A8 L could return 24/36/28 mpg. The combined city/highway rating is 27 percent higher than that of the base engine. , through Detroit, and over the Detroit River into Ontario, where a combination of highway and country roads kept the A8 at a reasonable speed. Audi and other dependable car brands ranked by J. D. Power. The study looks at the problems that original owners of 2012 model-year vehicles experienced over a one-year period. Source: