The upcoming BMW 335d has been spotted again being tested here in the U.S. This time the car was spotted sitting at a diesel pump somewhere in the southwest. The engine in the 335d, as well as the X5 ...

When putting fuel-efficient vehicles on a shopping list, most wouldn't mark down any BMWs, which are better known for 0-to-60-mph performance than for sipping liquid energy. Take the newest member of ...

It's a simple law of physics: The more things weigh, the more power needed to move them. This explains why automakers long shied away from gas-electric hybrids. If you want to use less fuel, why add ...