K11 pizza delivery setup.

My k11 is doing about 32mpg which is crap considering she's meant to be doing about 47mpg now I do realise age has a factor but is it really that bad. Is there anything I can do to her to get the mpgs back up I know my way around an engine but without a little of a hint tips I'm not sure where I should start to get this numbers higher.

Spark plugs.
Filters fuel
Oil filter
Oil
Mass airflow


What else could be a factor that could be causing the bad mpg.
If I rape her she gives me about 220miles from full till fuel light
If I drive eco I get about 250 survey she's meant to do a lot more on a tank
 
I seem to get about 42ish, I'd love to get up to 47. Maybe on a long run at lowish speed. She runs pretty sweetly, but I'd be curious to see what to check.
 
Something's amiss I'm driving round on rich mode (maf unplugged) and still get easily 300+ to a tank mixed driving. I'm pretty heavy footed too.


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I made a typo it was 32 ish I get sorry.


I'm getting new plugs filters and oil Gona replace the belts as they look tired . I'm told that will increase the mpg but I doubt it but I know she gets it.
 
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