Good to know you're being very mindful of how you drive.30.5 mpg on my last tank. I drove with the cruise on at 55 mph and tried to keep the rpm's at 1,500 in the bit of in town driving that I do. I am sure I can do better as I had to run it at closer to 2,000 rpm to make a meeting 20 miles away.
Only had mine for a little over a hundred miles, but I did notice the other day that in S it steadfastly refused to use 7th at 75, while in C it would. If I hit the paddles to go to 7th, half a minute later despite being on flat ground, it just shifted back to 6th. I doubt it has much of an impact on consumption as its only about a 250 RPM difference at that speed.Question for the GLA45 in sport mode does it go into the final gear? I noticed in other cars when you put it in DS mode or sport mode the the throttle response is better but does not go into the final gear on the highways, killing MPG.
But from your 31.7mpg looks like it does