Given a choice, more consumers indicate they would select a clean diesel engine over a hybrid electric engine to power their next vehicle, according to the JD Power and Associates Clean Diesel Market Assessment Study. The first clean diesel-powered vehicles are not expected to hit the market for at least three years. However, if given a choice between a traditional petrol, clean diesel or hybrid electric engine in their next vehicle, 27% of consumers said they would select a clean diesel, compared with 22% who would choose a hybrid electric engine and 51% who would select a petrol-powered engine.