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Old 08-24-2018, 05:27 PM   #125 (permalink)
redpoint5
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Join Date: Aug 2010
Location: Oregon
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Acura TSX - '06 Acura TSX
90 day: 24.19 mpg (US)

Lafawnda - CBR600 - '01 Honda CBR600 F4i
90 day: 47.32 mpg (US)

Big Yeller - Dodge/Cummins - '98 Dodge Ram 2500 base
90 day: 21.82 mpg (US)

Chevy ZR-2 - '03 Chevrolet S10 ZR2
90 day: 17.14 mpg (US)

Model Y - '24 Tesla Y LR AWD

Pacifica Hybrid - '21 Chrysler Pacifica Hybrid
90 day: 85.85 mpg (US)
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The only place for fuel savings to come from would be from advanced ignition timing. Unless the car is made to run on higher octane, it won't advance the ignition just because a higher octane is used.

My TSX might advance the ignition another 5 degrees running on 91 octane compared to 87. I tracked fuel economy for several months and didn't significant differences in fuel economy and decided to run regular.
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