The primary reason for such improvements has been the steady rise in fuel costs. (scientificamerican.com)
You have the added benefit of not having to worry about fuel costs of driving enthusiastically, as a full charge costs in the region of # 5. (evo.co.uk)
The two - liter, 140 - horsepower engine saves money on fuel costs by helping the sedan average 34 mpg on the highway. (automotive.com)