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The 'easiest ' low cost and most effective thing to do first is the injection timing check.
Do that and see what is helped or not..
I suggest only doing one thing at a time so you will know when you get through what it was that was in need of change... for future reference.
It is also something you should be able to do with a little studying and patience... lots of instructions in the archives... it is called the 2mm valve movement /drip method... right out of the MB FSM...
Your car has 236k miles... but you were not pleased by 28 mpg ? What MPG were you expecting ?
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