[Shop-talk] 93 Octane Gasoline along I-80 in western Wyoming and in Utah?

[DAVID MASSEY]

First off, turbochargers limit boost to a certain PSI above ambient so less absolute pressure at higher altitudes.  Also, modern cars all have knock sensors which accommodates lower octane fuels by retarding ignition timing.  Hence no need for higher octane at higher altitudes.
Dave



On Monday, September 21, 2026 at 08:34:36 AM CDT, Philip Ethier <pethier7 at gmail.com> wrote:



On Mon, Sep 21, 2026 at 7:43 AM Jim Franklin <jamesf at groupwbench.org> wrote:

You won’t find it in higher elevations because the effective compression is lower in the thinner atmosphere. Surprised you don’t see any on the flats before the hills though.


What about all the turbocharged cars in mountain areas?  


Jim

On Sep 21, 2026, at 07:43, Philip Ethier <pethier7 at gmail.com> wrote:



Looking for 93 Octane Gasoline for a trip out to Salt Lake City and not finding online any record of 93 Octane gasoline along the way.








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