dh, at the risk of sounding anti-California....oh hell, wait...
Anyway, my '92 got 14.5mpg rolling around Pensacola, FL for 4 months bone stock with stock sized tires and only a K&N in the stock filter housing. On the freeway going back to Michigan and then out to San Diego I got over 20mpg pretty much the whole way with that TBI 350 and 700R4.
After a few months in Cali though, feeding it that Cali low emissions goo filled gas, my mileage dropped. Lucky to get 13 with the stock configuration. I truly believe the quality of your gas out there due to all the BS additives it's required to have messes with it's energy content or something.
I got better mpg after I returned to Michigan but never did see the "pre-3.5 years in Cali" mpg again.