High spec similarly comparison for all three models (R66, B505 and EC120), meaning Garmin 750 GPS, Garmin G500H for R66 and EC120, A/C, Floats etc. and 2 hours of fuel + 30 min. reserve, an 80kg pilot and usefull load become approx. 320 kg. for R66, 235 kg. for B505 and 270 kg. for EC120.