I'm wondering what other people are experiencing with C180 fuel consumption. I've just started checking mine and it's not that great BUT I only drive it from the burbs into Sydney (total about 15 kms in and 15 kms back) through morning and evening traffic up and down hills as well. Specs are:

C180 (Apr 1994)
Shell Optimax RON 98
last reading 12.35 liters/100 kms
132,000 kms on the odometer
no A/C turned on as its just turned spring

I've changed the air cleaner and did the plugs this weekend. I noted that all the plugs had a bit of dry carbon black on them, which normally indicates too rich a mixture. I'm wondering whether I might need the lambda sensor checked or the injectors cleaned?

Any comparisons out there or ideas on improving fuel economy?