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Every car sold legally in the United States is required to run perfectly on regular gas. That's a fact, every gas fueled car in America runs fine on regular. Some manufacturers recommend premium gas...you don't need it. The only time you will be able to notice a difference is on the extreme high end of performance, speeds and techniques that will get you pulled over faster than you can say 'unleaded'.

You may notice a difference in older cars, which will show itself as Knocking, which is simply pre-ignition, the gas in the cylinder firing before it is meant to. The higher octane gas has more of an additive that slows the burn, preventing Knocking. You'll know if your engine is knocking, you can't mistake the sound. If it is, a tuneup will set it right. If it isn't, put your money in your pocket and enjoy your new Lexus with it's tank full of regular.

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Q: What type of fuel is required for the Lexus GX470?
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