There are some tips for motorists who want to improve air conditioning and their gasoline mileage without buying gas-saving gadgets.

有些开汽车的人想要改进车内的空调状况和每英里平均耗油量而又不必购置省油的装置，这里有些建议可供他们参考。

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Gasoline electric hybrid models like the Toyota Prius improve mileage by a further 20 percent over conventional models.

像丰田普锐斯这样的汽油电动混合动力车比传统车型的行驶里程提高了20%。

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Diesel fuel has a higher energy density than gasoline, so a diesel engine gets better mileage.

柴油比汽油能量密度更高，所以柴油发动机行程更长一些。

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Moreover, ethanol yields about 30% less energy per gallon than gasoline, so mileage drops off significantly.

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Cars that weigh less can use smaller, more efficient gasoline engines that get better mileage.

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Available in front- and all-wheel-drive versions, the stylish midsize hybrid luxury crossover SUV is quicker and gets better mileage than its gasoline powered equivalent.

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