The actual regulation is 40 CFR Part 80 (“Regulation of Fuels and Fuel Additives”): subparts A (general provisions, applying to all 40 CFR Part 890 fuels programs), B (controls and prohibitions), C (oxygenated gasoline), D & E (reformulated gasoline), G (detergent gasoline program), H & O (gasoline sulfur) and J & L (gasoline toxics).
http://bbs.wenxuecity.com/rdzn/3938617.html
我自己的经验是costco的油不如shell的跑得多
gasoline, required by state law
https://www.fueleconomy.gov/feg/ethanol.shtml
https://www.energy.ca.gov/almanac/transportation_data/ethanol.html
https://www.pure-gas.org/index.jsp?stateprov=CA
https://www.pure-gas.org/index.jsp?stateprov=NY
说这个可能导致引擎机件老化/损坏。不知道大拿们有没有感受到加了 Shell 的油，一脚踩下去马力大一些？（可能是心理作用）
https://en.wikipedia.org/wiki/Top_Tier_Detergent_Gasoline
现在都用电脑控制点火提前角了，好车也能用低octane的油
否则的话，，，，
Thanks to the Clean Air Act, the Environmental Protection Agency regulates fuel and fuel additives used in cars (and other engines) because burning gasoline contributes to pollution.
The actual regulation is 40 CFR Part 80 (“Regulation of Fuels and Fuel Additives”): subparts A (general provisions, applying to all 40 CFR Part 890 fuels programs), B (controls and prohibitions), C (oxygenated gasoline), D & E (reformulated gasoline), G (detergent gasoline program), H & O (gasoline sulfur) and J & L (gasoline toxics).
长话短说，所有的汽油都基本一样
油门踩到底regular大可代替premium.俺的就用regular代替premium开了11年8万迈p事没有。
刚换车那会曾经记录了一阵子油耗， 每次加油后里程清零，到下次加油时加油量和里程相比。
几个发现：
1) 不同品牌的汽油没有明显差别
2) 冬天和夏天有区别
3) 加州的油耗高
发现有明显区别，再后来去shell, 发现惊喜
说明书上写了“for better performance, use premium gasoline”