GP is correct and more relevant than you think, because fuel efficiency is immediately linked with the hope of avoiding global warming. Unfortunately people believe too much that &quot;we can maintain our lifestyle without breaking the emission limits that we set&quot;, and the truth has to be reminded: We can&#x27;t.<p>We need to reduce our lifestyle. Live closer to workplaces so we don&#x27;t need the car at all, which requires a complete rearchitecture of the cities where jobs are knit with housing and public transport, like Sydney or many places in Europe. US people have a difficulty understanding this, because petrol have been so cheap and untaxed for so long that they&#x27;ve built their cities around &quot;1 car, 1 person&quot; - and now they secretely hope for fuel efficiency improvements &quot;to maintain their lifestyle&quot;. No, sorry, they&#x27;re just killing the planet.<p>&quot;What about China, who pollutes much more?&quot; Yes, they should be allowed to reach their economic development, because US should pollute much less per inhabitant. An American emits 6x what it should, a Chinese person 1&#x2F;6th.<p>This is why GP wrote this warning. And it&#x27;s important because some people still don&#x27;t believe it.<p>Similarly, cigarette packets still have to remind &quot;Smoking kills&quot;, because a lot of smokers aren&#x27;t persuaded yet.