Gasoline from the various suppliers has different BTU or energy content. So changin fro different brands can effect FE. I use Shell unoxygenated fuel, because I have found it gets a little better milage.

Ducit Amour Hybridae
Mark Smith
Master Certifited Technician
Tempus non reparabilis fugit
"It isn't pollution that's harming the environment. It's the impurities in our air and water that are doing it."

Best Tank 35.0 MPG