Austin gets its own "new and disimproved" formula (one of the 20-odd blends stupidly mandated in various parts of the country), which changed about a year ago. The new stuff smells like kerosene and promptly dissolved an old plastic air cleaner spacer on one of my carbureted cars, but really doesn't seem to hurt gas mileage (on either the EFI or carbureted cars0 as much as the "winter formula" gas that we got prior to this latest re-forumlation.