The Mercedes Viano is essentially a van with more seats, so there's loads of interior space..rash tested in 2008 by Euro NCAP the Viano scored four stars for adult safety and three for children. The mechanical build quality of the Viano is very high as it shares a platform with Mercedes' highly dependable commercial van, the Vito.
Expert hypermiler Wayne Gerdes set a new Guinness World Record for fuel economy in a 2013 Volkswagen Passat TDI, a diesel-powered midsize sedan. The Passat used just 104.94 gallons of fuel for an average fuel economy of 77.99 miles per gallon. That beats the old record, established in 2009 by an Australian couple. Over their 9,505-mile trip, Helen and John Taylor averaged 67.90 miles per gallon in a 2009 Volkswagen Jetta TDI.
It costs nothing for the first three years or 36,000 miles you own a Passat TDI because the diesel exhaust fluid is included in Volkswagen's free maintenance program. Volkswagen says the urea tank should be refilled every 10,000 miles, making the first three on the house. How often a diesel vehicle needs urea can vary, so 10,000 miles is only a guide.