Volvo V50 2.0 FlexiFuel can be converted to LPG – what to note ?

Hello, For a week now I am proud owner of a V50 2.0F R design. Now the question arises: Does it make sense to install a Prins LPG gas system in the car with the FlexiFuel system or should you continue driving on ethanol (E85) ? I intend to have a Prins VSI II with a 62 L tank installed, of course with the loading floor increase of about 2cm from the AWD model. The offer from the gas builder of 1900€ is already available – what about the ethanol sensor at LPG operation – “spins” which then does not exist without flow? Who has already been able to gain experience here and what other things to consider ? Thank you for your input.