A lot of Money for not much Hybrid
Bumping up to the Active Hybrid 5 Series over the other RWD 335i (which is equipped with the same engine) will cost around $8,500 and only returns an added 2 mpg combined. Around town, the Active Hybrid 5 will give you a 3 mpg gain over the 335i, rated at 23 mpg, while on the highway the Hybrid sits at the same 30 mpg as the gas only car. In our week with the car, admittedly with it stuck in Sport and Sport + mode most of the time, we managed 22 mpg.
Driving about 12,500 miles a year, and paying $4.00 for a gallon of premium fuel, you will only be saving about $160 a year, which means that you will need to own the car for at least 53 months to pay off the investment made on the hybrid system. The upgrade to the Active Hybrid 5 over the 535i does include some standard goodies like chrome accents and a 9.5-inch display screen, but still, the smart choice seems to be: stick with the conventional gas-powered 535i.
Of course, keeping the car in Eco Pro mode and paying attention to driving fuel efficiently could help these numbers quite a bit. But then why buy a BMW?