We set out to verify these cars' lofty highway-fuel-economy ratings—42 mpg for the Jetta, 46 for the Cruze—by driving from our Ann Arbor headquarters to the world's largest truck stop in Walcott, Iowa. After that 409-mile drive, the Jetta was still 200 miles from empty and the Cruze more than 300, so we turned around and headed for Engineered Diesel in Allendale, Michigan.

Read the full Comparison Test here: http://bit.ly/17jqq5E

CARS: 2014 Chevrolet Cruze 2.0TD, 2013 Volkswagen Jetta TDI