Zodiac open 4.2

[Old rover]

Evening All
In the near future I will be taking delivery of a Zodiac open 4.2 with a Mercury 50 on the back . Can anyone give me a rough idea of the performance and fuel economy I can expect .
Thanks

[jonp]

My daughter has a 500pro with a mercury 60hp which gives amazing economy.
Top end speed over 30kts, cruise at 4200-4500 returning around 38-40kh burning 8.2 to 9lt per hour. Her mercury seems to have plenty of torque, still achieving 29kts with 5 adults onboard.