More and more motorists are becoming interested in fuel-efficient cars and they don't have to be electric vehicles. Researchers have been working to improve conventional internal combustion engines and experts believe fuel consumption could be reduced by half in the future.compare it! Compact Cars Are Put to the TestIn difficult economic times consumers cut back and car buyers often turn to smaller cars to save money. There is now a huge selection of compacts on the market. Besides two new models, the Golf 6 and the Renault Mégane, the BMW One Series and the spacious and practical Peugeot 308 are also popular options. Our test candidates prove that a small silhouette doesn’t necessarily mean less pep. drive it! put the four candidates to the test.