# Gasoline Octane

**URL:** <https://community.cartalk.com/t/gasoline-octane/30634>\
**Category:** General Discussion\
**Created:** [May 18, 2009, 4:59pm UTC](https://community.cartalk.com/t/gasoline-octane/30634 "2009-05-18T16:59:29Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![stu1094](https://avatars.discourse-cdn.com/v4/letter/s/71c47a/32.png) [@stu1094](https://community.cartalk.com/u/stu1094)\
**Post date:** [May 18, 2009, 4:59pm UTC](https://community.cartalk.com/t/gasoline-octane/30634/1 "2009-05-18T16:59:29Z")

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Howdy, many gas pumps now dispense multiple grades through one hose. If the previous customer bought regular(87) and I purchase premium(93), how much regular comes out before I get what I’m paying for. If I only buy 3 gallons what is the resulting octane.

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**Author:** ![Joseph\_E\_Meehan](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/joseph_e_meehan/32/21_2.png) [@Joseph\_E\_Meehan](https://community.cartalk.com/u/Joseph_E_Meehan)\
**Post date:** [May 18, 2009, 5:03pm UTC](https://community.cartalk.com/t/gasoline-octane/30634/2 "2009-05-18T17:03:27Z")

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If I only buy 3 gallons what is the resulting octane.

Somewhere close to 92.86