We have two Chevrolet Cruze turbodiesels. They are averaging just about 40mpg in mixed highway and city use. Unlike our gas Cruze the trip computer is pessimistic. The Truth About EPA City / Highway MPG Estimates - Feature - Car and Driver
Not many of those TD Cruzes out there. All the reviews I have seen on them they got great fuel economy and are real peppy. I have only seen one on the road out where I live. Chevy did not do a good job of advertising them.