Smart 451 for everyday use, but which engine?

Hello, my work path is about 8 km easy (5 times a week). In addition, once a week about 60 km and at the weekend to the side job again 120 km. Summa summarium would be moved a vehicle about 6000 km a year. For the correct long distance and fun rides keep the current vehicles here. However, I look for a “something smaller” companion, which consumes “not so much” (I’m rather used to 15 l/100 km) and is good for everyday life. Important would be: automatic, armrest, cruiser, (leather) and some space for the driver (I’m 1.95 m tall). I have already used up to 5 years ago a Smart 451 of 07 with the 71 hp petroler over 35,000 km. Also there only as a second car for the city. At that time I told myself however, I don’t want to buy 71 hp petroler anymore, because he consumed with me about 6.5 l/100 km. So if then a Brabus or a diesel (pass vs. really cheap). Now my considerations go back to the direction Smart. And here you are talking about Brabus?