A test run by German magazine Auto Bild found that an advanced diesel
engine in a Mercedes-Benz SUV was more fuel efficient than a gas/electric
hybrid engine in a Lexus SUV.
The vehicles were driven from New York to San Francisco and the diesel
engine had a highway fuel consumption rate of about 2 gallons every 100
kilometers, which is about 62 miles. The hybrid consumed about 2.2 gallons per
every 100 kilometers. In other words, the diesel got about 31 miles per gallon,
while the hybrid got about 28.
However, the test showed that the diesel was slightly less fuel
efficient than the hybrid in city driving.