No disrespect intended, but there is absolutely no way you are getting 37 mpg in a 535 unless you are going downhill most of the time for those 37 miles.

 

20.8 mpg 50/50 mostly D mode... sometimes DS and M

 

The 535 is amazing fuel efficient if you are gentle on the gas. Remember those turbos just suck gas when the car is floored but it is so much fun : I am a bit of a lead foot and in mixture of stop and go in town commuting and highway driving for errands I get about 20 mpg. These days in a mixture of most rush hour highway commutes and driving errands I get around 22.8 mpg. On highway trips I have gotten close to 28 or more mpg.

 

Thanks for the replies guys. So what about the 550i? Is it going to have a big difference in mpg? I will probably be driving 50/50 city and highway!!

 

To tuffluck: After checking actuals for a few months and realizing they are virtually identical I just use the iDrive now.

To jmsod: This best ever trip was recorded after an iDrive reset from a flying start (already at 110km/hr) on a 60km trip on a perfectly flat piece of highway. As a result of the flying start, there was no loss due to accelerating to 110. There was no wind.
My daughter and I had decided to see if we could drive at a set speed with no braking to break our retired 325i record we set in 2005. (We couldn't break it).
Because it was a challenge, I didn't brake, never touched the cruise and kept the speed low. The car was empty with a low fuel tank.
My normal mileage with no special conditions on the highway is always between 30 and 33 mpg.
BTW, I have found that travelling 10 mph more will greatly impact the mpg. For my car, travelling at 120 km/hr (75mph) will drop my mileage to 26-28 mpg.