Premium Fuel at Altitude?

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Joined
Sep 5, 2021
Threads
34
Messages
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Location
The Natural State
Taking the 2005 LC with 245k mi. on a 3-wk family road trip through South Dakota, Utah, and Colorado this summer to show the kids the things.

Usually I run ethanol-free 87-octane and get 13.5-15.5 mpg. For the road trip, is there good reason to switch to anything else (like 91-93 octane), especially if driving at higher altitudes and loaded with 4 people and their stuff?

Cheers!

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