oh yeah that's right, 19. I only remembered it was less than 20.There were 19 total cabs in the U.S. with the Brabus sports package. Mine is one of them. And the car is insanely quick. I can't keep that thing under 80 mph's, it always gears itself to the perfect rpms to keep it in its powerband. It was obviously tuned for performance. Fuel economy is not the primary goal, based on how the turbocharger works so early in the powerband. The transmission programming won't allow turbo lag because it forces lower gears to keep rpms up high enough. The ratios are close enough to prevent turbo lag. It's genius.
To anybody complaining about mpg's, you're just going to have to trick the transmission programming. Try manual mode (Sport) more often, and shift early to keep the rpm's low. Try economy mode and use light throttle pressure all the time. You will have to drive strategically and safely, to stay out of the way of the faster cars, but you will see 40+ mpg's is possible.
But if you drive it like you stole it? Expect low 30s in the mpg's due to eager turbo boosting and aggressive shifting.
I never drive a regular Smart before, so I cannot really compare performances like you do, but like you said, the car is quick. I once loaded the car (removing subwoofer of course) with a 28 inches suite case and a small carry-on bag and one 230lbs adult, and I am 190lbs, the car is working without a sweat. Sometimes when I downshift hard, I can even hear a small crack noise from my Brabus exhaust. I still feel bad that we don't get Brabus tuned in US.
In regards of MPG, I am averaging around 42ish on my daily home to work commutes, mixed of highway and local and I am averaging 36.8 on my total 5,000 miles per trip computer. I hit 99MPH multiple times, it is very interesting that my cluster shows a top speed of 130MPH, but when I hit 99MPH, it only goes 2/3 of the numbers. This car is my first micro/small/economy car, I am really happy with its current MPG, because all of my other cars are around 20 to 25 to the best.