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Originally Posted by gsxr
Check all filters, or just replace them if they are of unknown age. Check for fuel leaks as well. Wouldn't hurt to check for dragging brakes - jack up each tire, the wheel should spin very easily with almost no drag. Increase the tire pressure to 32-34psi if you can, the low MB recommended pressures are more for comfort than MPG. But yes, 22.8 seems low. Make sure you are doing the math properly, you'd be amazed at the number of people who don't do this correctly:
1) Fill up completely
2) Reset trip odometer
3) Drive until the reserve light comes on
4) Fill up completely
5) Divide miles traveled (trip odo) by number of gallons used in step #4
6) Repeat starting at step #2 :
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Heh - I'll definitely do the Italian Tune-Up.
And that's exactly how I calculate MPGs...there will be small variations because I don't top off tanks past when the pump clicks off the first time, but I'm confident my numbers are pretty accurate overall.
I'll go through all the filters and clean things up. I'm getting new tires in a few weeks, so that will be a good chance to check brakes and other things in the drivetrain from underneath (the brakes and rotors were replaced less than two thousand miles before I bought the car, but you never know...)
The last thing to check (and which sounds like it would be the most trouble) is something in the injectors or injector controller. Ugh.
Thanks for the suggestions.