The tiny Tecnam Twin is indeed interesting. It compares more closely to singles like C182 or Cirrus SR20 in the speed, horsepower and fuel flow compartement than with any other light twin. Indeed, its total fuel flow in cruise is lower than for the C182, and almost matches the SR20. Useful load is slightly lower.
Fuel capacity is given as 200 liters, range is 620 NM plus 30 minutes reserves at 65%. This according to manufacturers website information, where single engine climb also is listed as 300 fpm. According to Aviation Consumer, the single engine climb is 230 fpm, with 200 fpm achived in the magazine's actual test flight (altitude not specified). Unusually for a twin, there is no rudder trim; the Aviation Consumer's pilot did not miss it during any single engine phase. Manufacturer's single engine ceiling is 7000 or 7500 ft.
Rotax engines, of course, run on mogas or avgas.