Nearly one-third of new-vehicle buyers indicate they have some level of purchase consideration for a vehicle with a clean diesel engine -- about the same number that indicate they have heard of clean diesel technology, according to a JD Power survey. The JD Power and Associates Consumer Diesel Overview Study found that of the more than 5,200 survey respondents, 12 percent say they are "very likely" and 19 percent indicate they are "somewhat likely" to purchase a new vehicle with a clean diesel engine. Despite these numbers, only 5 percent of respondents say they are "very familiar" with clean diesel technology.