天气越来越热了，大家在开车的时候都会第一时间打开空调。就算是乘坐出租车，大部分司机也是开了空调的。但是也不乏部分司机为了省油，选择不开空调，而是打开车窗通风。今天小编就借着这个话题跟大家聊一下关于汽车省油的几个误区，看你是不是也犯了这样的错误。
1.开空调和开车窗到底哪种省油？
很多司机都认为不开空调可以省油，所以宁愿忍受着高温也不开空调。其实，开空调关窗和开窗关空调究竟哪个省油，要分两种情况来说。中低速行驶，也就是80km/h以下，不开空调确实是比开空调要省油。而上了高速路行驶，由于开窗会进一步增大风阻，而由于风阻所增加的这部分油耗是要比开空调所增加的油耗要多的，所以开空调相对是更省油的作法。
2.空档滑行能省油吗？
有部分司机在下坡路或前方遇到红绿灯的时候，就会将挡位切入空挡，让车慢慢滑行，以为这样做可以省油。其实，空档滑行省油是在以前使用化油器的年代，那时候车辆无论处于哪个挡位，都会有空气吸入，化油器也自然就会进行喷油燃烧，而空挡滑行下，发动机默认为怠速状态，喷油量相对最小，从而也就最省油。
但是现在车辆都采用电喷技术了，由电脑控制燃油喷射的量，带挡滑行油门松开的时候，车辆处于被托动的状态，而此时电脑会控制停止喷油。而当空挡滑行时，电脑会默认为怠速状态行驶，反而会持续喷油以维持怠速。所以说对于当时当下的车辆来说，空挡滑行相比带挡不仅一点不省油，反而还会更费油，并且也不利于行车安全。
3.涡轮增压比自然吸气发动机省油吗？
涡轮增压发动机一般会比同排量的自然吸气发动机油耗高一些，但比性能指标上齐平的更大排量的自然吸气发动机油耗那是省很多了。这是由涡轮增压发动机的工作特性决定的：在转速较低，涡轮没有介入的时候，涡轮增压发动机相当于是一台自然吸气发动机。不过如果是市内行驶的话，在堵车严重或者红绿灯比较多的情形下，涡轮增压车型还是能够依靠较小的排量实现节油目的。
4.排量越小越省油吗？
有很大一部分人都存在这样的认知，车子排量越小越省油，越大就越费油。其实按常理来说这话是没错的，但是我们也要考虑实际情况，准确点说应该考虑到车的重量及使用用途。如果你的车很重，但是排量却比较小，就会产生小马拉大车的效应，因此这样的小排量车不仅不省油还费油。所以，你若是为了省油而选择某款车的小排量版本其实并不一定是划算的。
5.手动变速箱比自动变速箱省油吗？
事实上现在大部分人买车已经不会考虑手动挡了，因为相对来说，手动挡操作更麻烦也更累。手动挡比自动挡省油那也是以前了，那时候5挡的手动是会比4挡的自动的挡位多，还可以人为的控制在发动机的高效转速区间，同时也没有液力变矩器中间过程的损耗。但现在的自动变速箱不仅结构更优化，挡位数更多以及升降档程序升级等方面都变得更加智能化，所以早就没有什么手动变速箱比自动变速箱更省油一说了。
我们总是喜欢以自己主观的角度去看待问题，这在很多地方确实能帮我们快速解决问题，但是脱离了事实基础的情况下，在许多方面也特别容易犯错误。就比如汽车省油的这五个认识误区，很多人都存在这样的错误认知，很多事情不能一概而论。在汽车技术飞速成长的今天，我们需要对汽车油耗有一个全新的认识，只有这样，我们才可以总结出更全面、更科学的省油方法！
原创文章，作者：cesifu，如若转载，请注明出处：http://www.cesifu.com/article/46673.html
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