- First Name
- Edge
- Joined
- Jul 17, 2021
- Threads
- 5
- Messages
- 1,351
- Reaction score
- 1,825
- Location
- CARBONDALE-Atlanta
- Vehicle(s)
- PORSCHE
- Engine
- 2.5L Hybrid
I use Costco also. I wait until tank is low, add 9-10 gallons of 87 and the last 2-3 gallons of higher octane. 95% of the time I get 42.0 to 44.5 mpg on with the mixed octanes, only 37-38 mpg on the 87 octane...but my Hybrid is noticeably quicker with my blend of the two octanes.
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