For the winter months here in California (if you can call them that) the fuel is oxygenated. Oxygenated fuel produces lower MPG, for the summer months we have 'normal' California gas. I just don't recall if we are on winter or summer gas right now.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.