16/11/2019 · “We have three ProMasters, all have problems, and one has been at the dealer for a month”. Service/Maintenance Vans (City Vans) 1. Mercedes Metris. MPG: 22. 199 cubic feet of cargo space. Engine type: Petrol. Price: $31,000. With the Metris, Mercedes Benz cleans up nicely, as far as the service and maintenance van category goes.