In spring 2011, lastauto omnibus magazine tested a MAN TGX 18.400. It had a D2066 six-cylinder engine and a fairly large XLX driver’s cab. A truck for large fleets? Well, trucks in fleets should, first of all, be economical. The 10.5-liter (640 cubic inches), six-cylinder engine in the MAN TGX 18.400 left the testers satisfied; …