Originally Posted by DD_545i

The only way I know of to get 27mpg highway is to reset the mileage computer while doing a constant 60-70mph and keep it measuring while maintaining that speed without any stops or heavy visits on the gas pedal. Then, you'll get that. I got around 27mpg on a trip once, but it was 99% constant 75mph on cruise control with no hills and no traffic. This is a pointless measurement though, it doesn't represent real life. As a daily driver, in stop-go traffic or with lots of traffic lights, don't expect much more than 20mpg (and 18mpg if you floor it all the time like some of us enjoy doing ). A 528i or 530i in any kind of test you like will always outperform a 535i, 545i or 550i. If they wouldn't, then nobody would buy one.

Originally Posted by tpaxadpom

Guys I need your help. I am looking at 5 series for my wife (2008 or newer). It's going to be a daily commute car. On a used market the cost of 528i, 538i or 550i is close enough not to worry about the price difference. 550i with M sport aero package on 172 wheels look very attractive and I personally don't like the look of standard package. Now looking from a daily commute perspective, tires for 172 wheels cost a lot and don't last long. I was shocked to read about the mileage people get with 172 rims. 535i is probably the best in terms of power vs fuel economy ratio whereas 528i is a true commute car.
Most 550i come with sports package and look fantastic. How much does it cost to install clear bra? Does it look ok? I worry about the chips and rocks given it's going to be a commute car. She mostly drives freeway with mild traffic.
I never see 535i or 528i with M sport package for sale. Only those that were in accident. I found one 528i after accident with the sports package on 172 wheels. I don't know if I should even consider car with salvage title but it's very low mileage.
How is turbo on 535i? Is it reliable?

Please help me out to make the right decision.