Chicago Tribune. In an interview with Tribune auto columnist Jim Mateja, GM Vice Chairman Bob Lutz said that the company was putting a hold on the development of future rear-wheel drive vehicles until regulations on CO2 limits and fuel economy are sorted out.
Rear-wheel drive cars tend to be larger and heavier than front-wheel drive or are high-performance cars.
So it comes down to the matter of fuel economy. Or as Lutz says: “We don’t know how to get 30 percent better mileage from” RWD cars.