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Hi I've been using a rental car for the past few days and it's a full to full type of deal. They asked me to fill it up with 95 octane fuel. This seems to me like a bit overkill, I'm wondering if I save some money and put in regular will they have any way of knowing?

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    Is this Europe? In Europe 95 (RON) is regular gasoline. – Krist van Besien Sep 3 '19 at 5:39
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    if they tell you to use 95, use 95. They will have a good reason for it. – jwenting Sep 3 '19 at 6:05
  • I'm voting to close this question as off-topic because this is about car maintanance, not about travel. – Willeke Sep 3 '19 at 6:25
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    @Willeke I have to disagree. This is a situation which arose only because the person is traveling, not just because they need to put petrol in a car. I can easily see someone from another continent (like that big one west of the Atlantic where they do lots of things strangely) being confused by this and needing to ask. – Michael Hampton Sep 3 '19 at 6:47
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    Here in UK 95 octane is regular, 97 octane is super. You can't get less than 95 octane. If you can get less than 95 octane in the unstated country, they will know if the car doesn't then run properly. – Weather Vane Sep 3 '19 at 8:15

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