Dacia Logan MCV Laureate, gas or diesel ??

Have a driving company and drive around 100,000km a year. I’m about to get a Dacia and am a little unsure about the type. Actually I wanted to buy a 7-seater with 105 hp and a gas system (I heard that you can get it from Jan. 09 also in Germany ex factory). The seller advised me not to do so, because with a gas system of the open expensive maintenance occur. The diesel runs against it and runs. I am really unreliable now, because reliable t and low operating costs are enormously important to me. Does anyone have any expertise on this point and how is the consumption of the gas plant at all??