2013 BMW 650i Gran Coupe Long-Term Update 5
Have Fuel, Will Travel
As is done with all of our long-term fleet vehicles, I've been religiously recording every drop of fuel that enters the Gran Coupe's 18-gallon-or-so stomach. Mileage also is recorded at each fill-up and entered in a giant spreadsheet so that average consumption can be calculated not just for individual trips, but also for the vehicle's entire year of service in the MT fleet. Not that anyone buys a $113,000 luxury sports sedan for its fuel efficiency, but it's an interesting case study nonetheless.
The vast majority of the more than 17,000 miles on the Gran Coupe have been spent around the Los Angeles area in the usual city traffic. Lots of rush hours equal lots of stop-and-go driving. The worst single-tank fuel average recorded was a paltry 10 mpg, and I'll go ahead and assume that an editor's heavy foot was to blame. (While our long-term vehicles have individual chaperones, each car sees plenty of driving with other staffers when its chaperone is away on a press junket or reviewing a different vehicle for a few days.) The best single-tank average was 24.1 mpg, achieved by the Gran Coupe's previous caretaker, Angus MacKenzie, on a freeway cruise to Arizona. I nearly matched his average on my own trip to Arizona months later, recording a 24.0 mpg figure en route with my wife to the red rocks of Sedona.
Overall, the Gran Coupe has achieved 17.4 mpg over the course of 17,398 miles. That's not particularly thrifty, but it isn't too far off its EPA rating of 19 mpg. The EPA city/highway ratings are 17/25 mpg, and this Gran Coupe has seen much more driving in city conditions than it has highway jaunts.
An interesting trend: As the 650i has racked up the miles, its fuel economy continues to improve. When the car had just a few thousand miles on its odometer, we were averaging closer to 15.6 mpg. As the car was driven more and more, the average started to climb -- through 16.6 mpg through 10,000 miles, to 17.1 mpg at 12,000 and on to our current 17.4 figure. I figure typical engine break-in has something to do with the improvement. The fuel efficiency continues to climb despite the fact that I had the BMW's irritating start/stop engine function modified by the dealer to not default to automatically on. Now that the car remembers my preference as off, it hasn't been reactivated since the service 1500 miles ago.
More on our long-term 2013 BMW 650i Gran Coupe: