Have you considered a w124 300D 2.5Turbo? Mine gets between 29 and 36 mpgs. Comfortable, peppy, good commuter car. Or you could switch to VW (gasp!) and drive a 45-50 mpg TDI. Now THAT's a great commuter.

__________________
'91 300D 2.5 Turbo 330K
'00 VW TDI Golf, 190K
'67 BMW R50/2
'73 Norton Commando Interstate