A bad O2 sensor can cause a major decrease in fuel mileage.

With the 560SEL I consistently post 15 mpg on an all city tank, 17.5 mpg on a mixed tank and 19-20 mpg all highway running 80mph.

__________________
Mike Tangas
'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.