efficient and fast efficient and flexible efficient and friendly efficient and high-quality efficient and innovative efficient and less efficient and low efficient and practical efficient and productive efficient and professional efficient and profitable efficient and quick efficient and reliable efficient and responsible efficient and responsive efficient and robust efficient and safe efficient and secure efficient and successful efficient and sustainable efficient and timely efficient and transparent efficient appliances efficient application efficient approach efficient as possible efficient automation efficient building efficient business efficient capital efficient car efficient cars efficient cause efficient city efficient cleaning efficient code efficient collection efficient combination efficient combustion efficient communication efficient company efficient construction efficient control efficient conversion efficient cooling efficient cooperation efficient coordination efficient corporate efficient cost efficient customer service efficient data efficient decision-making efficient delivery efficient design efficient development efficient digital efficient distribution efficient driving efficient dust efficient economic efficient economy efficient electric efficient energy efficient energy use efficient enforcement efficient engine efficient engines efficient equipment efficient europe efficient european efficient exchange efficient execution efficient expression efficient filter efficient filtration efficient financial efficient fleet efficient flow efficient food efficient form efficient frontier efficient fuel efficient functioning efficient gas efficient governance efficient government efficient handling efficient health efficient heat efficient heat transfer efficient heating efficient high efficient home efficient homes efficient implementation efficient in terms efficient industrial efficient information efficient infrastructure