Another question I am often asked is about which fuel to use in our Lexus cars. Should we use the 87, 89 or 91 octane? Of course, we'd all like to save money on gas, and not use the more expensive fuel if it's not necessary. And there has been a lot of attention about this in the news and on TV lately.
The engines in our Lexus models have compression ratios that range from 10 to 1, up to 12 to 1, depending on the model. High compression ratios help provide increased performance, but really need the high octane fuel to take advantage of the available power without knocking or pre-detonation which can damage an engine. Many of our Lexus models do have sensors that adjust the engine to avoid that kind of damage, but that does reduce the performance available in those situations.
Our usual recommendation is to use the premium gas for the best performance and the best economy. With some of our engines, you may not have damage to the car using the regular, but you might lose some or all of the financial benefit because you may use more fuel than you would otherwise. And at the same time you would lose the option to take advantage of the full performance of your car should you need it. Your individual driving style and use of the car will make a big difference. If you have any doubts about what's best for your situation, ask your service advisor next time you bring your car in for service.
Best wishes for safe driving!
Nick
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