I always reset my mpg gauge every time I refill my gas tank.
37mpg is about 65 miles drove. I was manage to maintain at 37mpg up to 150 miles. Now, I am down to 34.5mpg (about 200 miles) due to one bad traffic with bumper to bumper over 1.5 hours

Depend on the traffic condition, how I drive and no air conditioning turn on; I can achieve 35+ mpg if I wants too. I can easily bring it down to 20mpg by gunning it every time I press the gas pedal.
I had been driving with Traction control turn off for a month. I love how the car handle and accelerate especially coming off a sharp 90 degree turn. Now, every time I drive, I had it turn off even in normal driving.
Maybe it's placebo effect or the Traction control of the Q50 is way too sensitive, I felt the ride is better when it is turn off.
How the fudge did you achieve 37mpg? Had you recently reset the mpg gauge?
Loving that you are driving with vdc off lol