Volkswagen Golf TDI

Can Clean Diesel Compete in an Electric-Drive World?

Hybrid gas-electric cars dominate Kelley Blue Book’s latest list of the most fuel-efficient vehicles. It’s no surprise that six cars in the top 10 list, released this week, are hybrids and two are small cars—the Mini Cooper and Honda Fit. But the two clean diesel offerings—one from Volkswagen and one from BMW—almost escape notice.