# Spark Plug analysis

**URL:** <https://community.cartalk.com/t/spark-plug-analysis/193001>\
**Category:** Maintenance/Repairs\
**Tags:** sparkplugs\
**Created:** [September 21, 2023, 11:15am UTC](https://community.cartalk.com/t/spark-plug-analysis/193001 "2023-09-21T11:15:08Z")\
**Posts on this page:** 3\
**Page:** 2

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**Author:** ![davesmopar](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/davesmopar/32/41750_2.png) [@davesmopar](https://community.cartalk.com/u/davesmopar)\
**Post date:** [September 23, 2023, 10:58pm UTC](https://community.cartalk.com/t/spark-plug-analysis/193001/21 "2023-09-23T22:58:10Z")

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May live in a high altitude state such as Colorado air is less dense at higher elevations, reducing the chance of engine knocking when using a lower-octane gas, so 85 maybe normal there…

> **[Colorado has different unleaded regular gas than other states. Whether it’s...](https://www.cpr.org/2022/01/04/colorado-gasoline-unleaded-octane-environmental-impact/)**
>
> 85 octane or 87 octane gas? In Colorado, there's a reason why there are two different options at the pump.

Of course, that could also be to low of an octane for a lower altitude and that is piston spatter from slight detonation… I guess time will tell… lol

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**Author:** ![Solidventur](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/solidventur/32/8634_2.png) [@Solidventur](https://community.cartalk.com/u/Solidventur)\
**Post date:** [September 23, 2023, 11:03pm UTC](https://community.cartalk.com/t/spark-plug-analysis/193001/22 "2023-09-23T23:03:46Z")

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My bad, the lowest here in Boston is 87 which is what I pump into my 2019 Sienna. Interesting about the line in parenthesis, not sure what it means.

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**Author:** ![circuitsmith](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/circuitsmith/32/40376_2.png) [@circuitsmith](https://community.cartalk.com/u/circuitsmith)\
**Post date:** [September 23, 2023, 11:16pm UTC](https://community.cartalk.com/t/spark-plug-analysis/193001/23 "2023-09-23T23:16:18Z")

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> [@Solidventur](#):
>
> Interesting about the line in parenthesis, not sure what it means.

There are 2 methods of measuring octane, called research and motor.  
In the US the two are averaged.

> **[Difference Between RON and MON | Compare the Difference Between Similar Terms](https://www.differencebetween.com/difference-between-ron-and-mon/)**
>
> The key difference between RON and MON is that RON describes the behaviour of a fuel in an engine at low temperature and speeds whereas MON describes the b

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