Originally Posted by willwren

E5 and E10 are not the only options in the States.

We use no Ethanol at all in Oregon. But CA uses either E5 or E10 depending on county.

The Ethanol blend creates a higher octane, but lower fuel economy. Nonetheless, the highest octane you can get in CA is 91 octane. This is why I tend to prefer driving my bone-stock L67 to CA rather than the Zilla. The Zilla has a thirst for Octane, even with the much less aggressive pulley sizes (2.5" or 2.2"). The 2.0" pulley in CA on 91 Octane E5 or E10 would kill me and my car.

If I'm doing a round-trip to Northern CA in EITHER car, I prefer to top off to a full tank in Ashland Oregon, in the hopes I can get back to Ashland on the return trip without having to fuel up anywhere in CA. With all the driving to and from the Chapel and Cemetery with my Family on this last trip, I failed to preserve any decent fuel, and ended up coming home with the 91 octane CA gas (unsure whether it was E5 or E10, but it was one of the two).