3800 Series II V6 Regal's standard 3800 Series II V6 delivers 200 horsepower and 225 lb-ft of torque-all the engine you need for quick acceleration and confident passing. With an EPA estimated fuel economy of 20 mpg city and 29 mpg highway, the 3800 Series II V6 also gives you the kind of gas mileage that helps keep you away from the pump and on the road. 3800 Series II Supercharged V6 For swift, on-demand acceleration, the 3800 Series II Supercharged V6 has 240 horsepower and 280 lb-ft torque. Standard on Regal GS, it offers an EPA estimated fuel economy of 18-mpg city, 27-mpg highway.