Quote:
Originally Posted by 928S  It seems that everyone wants to believe that DI is more fuel efficient, but contrary to what you've read here and elsewhere (I've seen the same misinformation on other websites and in print magazines) GM says... http://www.cadillac.com/cadillacjsp/model/po_specification.jsp?model=cts&year=2009§ion=Powertrain
EPA Estimated 18 MPG City and 26 MPG Highway (RWD 3.6L non-DI Auto model)
EPA Estimated 17 MPG City and 26 MPG Highway (RWD 3.6L DI Auto model)
Note: DI is estimated to have a 1 mpg advantage for AWD, Highway only. |
GM says the DI engine is 3% more efficient than the non-DI version. Whether transmission ratios or EPA mileage cycles reflect this fact is another matter.
Direct-Injection technology
The 3.6L Direct Injection engine is the premium engine option for the 2008 Cadillac CTS. This technology on the 3.6L VVT engine contributes greatly to a 15-percent increase in horsepower; 8-percent increase in torque, and 3-percent improvement in fuel consumption. Additionally, the application of direct injection reduces cold-start hydrocarbon emissions by 25 percent and it is designed to operate with regular unleaded gasoline.
BTW I own the AWD DI so my EPA numbers also reflect some of this efficiency.