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Typically in the US, gasoline for cars is a mixture of refined crude oil and some ethanol up to 10%.

Since ethanol in the US is corn based, by buying gasoline are you buying kitniyot?

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    You are allowed to own Kitniyot. No problem. – Double AA Apr 1 '15 at 16:45
  • But I thought there was an issue buying it during Pesach, if you own it you could just put it away. – Zach Leighton Apr 1 '15 at 16:46
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    select.nytimes.com/2007/04/01/nyregion/01towns.html?_r=1 Note: This was an April 1st article. Anyway, the technical answer to your question is that once the mixture is inedible to a dog, it is permitted outright. So even if it was wheat based ethanol it wouldn't be a problem (assuming a dog won't sip gasoline - I never experimented). – Yishai Apr 1 '15 at 16:57
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    I recommend that you consult your rabbi and your dietitian before drinking an ethanol-gasoline mixture on Passover. – Isaac Moses Apr 1 '15 at 17:35
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    dupe? judaism.stackexchange.com/a/14979/759 – Double AA Apr 1 '15 at 20:06
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Dose of Halacha goes through the various opinions of toiletries that contain alcohol over Pesach. He explains why it isn't a problem.

R’ Ovadia Yosef (Yalkut Yosef 447:2) permits using products that contain denatured alcohol on Pesach. R’ Chaim Elazar Shapira (Minchas Elazar 5:37) writes that while people are particular, once alcohol has been denatured, it is not considered rauy l’achilah. Thus one may drive a car (on Erev Yom Tov and Chol Hamoed) even if the petrol is mixed with denatured alcohol.

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