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You should check your tire pressure a few times a year so if you haven't yet then it's most likely low, combine that with the wide, non LRR tires you have and you'll see a few mpg drop right there.
On the two VX's I've owned I've noticed that exhaust issues and non stock exhaust seems to lead to the o2 sensor failing, so you might not be able to revive a failing o2 sensor but unless you want to replace it twice, like I ended up doing on my first vx, I would fix the exhaust with stock parts first.
Also, does your VX have any dealer options? passenger side mirror, mud flaps, or A/C? each of those will cut your mileage back a little, not as low as you are seeing but they all have an affect.
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