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看到大家为高标号而疯狂，身边还有人开着老Camry，加着98号油。最近油价处于高点，这就更显得这个问题比较重要，我自己的观点就不放了，我转一些网上查到的专门解释的资料，我整理了一下。
Do I Really Need to Use Premium Gas?
Many years ago, premium fuel was thought (and sort of advertised) to contain added detergents that helped keep fuel injectors clean. At the time, fuel injection was rather new, and the injectors’ tiny orifices could easily get clogged by dirt. Therefore, many people bought premium-grade gas for that reason, even though the engine didn’t really require it. But today, virtually all name-brand gasoline (and probably all gasoline, period) contains a sufficient amount of detergent to keep the fuel injectors clean, so that’s no longer a good reason to pay an extra 20 percent for your gas.
Historically, premium-grade fuel has mostly been used in high-performance vehicles that have high-compression, turbocharged, or supercharged engines, though it’s sometimes required in more pedestrian cars as well (many Volkswagens and Mini Coopers, for instance). Particularly when running under heavy throttle, these engines produce high cylinder pressures that can make lower-octane fuels “explode” rather than “burn,” which can cause engine damage. This explosion is often referred to as “detonation,” and premium-grade fuel contains additives that help prevent it.（原理解释）
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划重点
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Three words are pivotal: “Recommended,” and “Required” or “Only.” And they mean different things.
“Premium Fuel Recommended.” This means the engine might produce a bit more power and better fuel economy if you use premium (typically only about 5% or less), but it will run just fine on mid-grade or regular. The small power and economy increases come from the engine being able to run greater ignition advance without causing knock.
“Premium Fuel Required” or “Premium Fuel Only.” This means you really should use premium. However, with recent advances in engine technology—most notably direct injection—it’s relatively rare nowadays to see “Premium Fuel Required” even on turbocharged, supercharged, or high-performance cars.
接下来例子实验：
According to Doug Herbert at Lexus, “Required” is a bit overstated. Herbert said that both vehicles (an RC 350 sports coupe and an NX 200t compact SUV) will run on regular-grade fuel without damage. But since both the advertised power ratings and the EPA fuel-economy figures were attained using premium, that’s what they have to put as the required fuel. However, he also warned that continued use of regular-grade gas would cause the engine’s computer to back off on the ignition timing—thus adversely affecting both power and fuel economy—and that it would continue to do so for a time even after the car is filled with premium.
总结：
But for now, the best way to save money is to use the lowest-octane fuel your owner’s manual says is OK, even if the fuel door “recommends” that you use premium. But if premium-grade fuel is “Required,” bite the bullet and put in the good stuff.
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