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.
Of course, you're probably more interested in fuel economy than hp. If that's the case, here are the numbers: The Prius c returns 53 miles per gallon in the city and 46 mpg on the highway for a combined average of 50 mpg. The standard Prius also gets 50 mpg combined, though its city and highway numbers are 51 mpg and 48 mpg, respectively.