Earlier this month, General Motors product chief Mark Reuss revealed Cadillac’s upcoming CT6 full-size sedan will be available as a plug-in hybrid and will be the “most advanced vehicle technologically in the world.” More information in regards to the car is slowly starting to surface, with the latest word from Motor Trend being that the PHEV CT6 will achieve more than 70 MPGe.
The 70 MPGe estimate is achieved thanks to the unique lightweight construction of the CT6. GM will use their patented mixed material body structure manufacturing process to produce the car, which combines high-strength steel, aluminium and steel stampings and castings to make a platform that uses 20 percent fewer parts, in turn reducing weight. The CT6 will be eight-inches longer than the current mid-size CTS, however it will be 53 lbs lighter.
In addition to its lightweight construction, the CT6’s all-new 3.0-liter twin turbocharged V6 engine and eight-speed automatic transmission will also aid in boosted fuel economy ratings. Little is known about the more efficient engine, however it’s expected to be the most powerful in the segment and will be coupled with a fuel saving start/stop system.
Even though Cadillac CEO Johan de Nysschen said the CT6 isn’t necessarily meant to do battle with the German full-size sedans, the drivetrain for the hybrid CT6 is beginning to sound a lot like that in the Mercedes-Benz S500 Plug-In-Hybrid. That car is offered with a 329 horsepower twin-turbocharged 3.0-liter V6 with a 107 horsepower and 257 lb-ft electric motor. The powertrain results in a 0-60 mph time of 5.5 seconds and limited top speed of 155 mph, but more importantly, it delivers roughly 78 mpg on the US cycle. Considering the CT6 will be much lighter than the S-Class, these figures should be easy for Cadillac to top or at least match.