My mileage dropped on my 300E by almost 50% in the past couple of months. The car has 90K on the odometer. Car runs fine otherwise. I just had a tune up done and the mechanic replaced plugs, wires, cap, filters and the 02 sensor. That was two weeks ago and nothing has changed in regards to the mileage. Any insight out there with possible causes? I've search the forum without any real help. Any advise appreciated.

Any fuel leaks? By the filter mainly? Sometime the rubber lines at the age of your car will tend to leak, especially since they may have beed disturbed when replacing the filter. How do the spark plugs look?

No noticable leaks but I haven't checked everything and the plugs were fouling prior to the cap and wire replacement.

Not to hijack the thread, but I have a fuel leak in my car, wonder where a good shop in Tampa to take it to would be? anyone?