Well, keeping on top of maintenance and fixing stuff when its wrong is definitely in the list of economy tips, so I think the answer is fixing these things certainly wouldn't do any harm.
None of them - except maybe the springs, and even then only if you use new replacements - would be all that expensive to put right over a weekend ?
Daox has
a Paseo that is on 53+ MPG so it seems possible to do better. If you use the search option (top, right hand side) there are a few threads on Paseos too.
Good luck.
EDIT - Plus its winter, which kills FE