Ethanol will kill your mileage.
Oxygen Sensor is another good idea.
Since you have 100K miles.
I believe they recommend 80K for its lifespan.
It will continue to work for a long time before it trips a check engine light.
I caught my error code by only doing the following.
Start the engine.
Idle it.
Than race it about 2500 rpms for 5-10 sec's.
Idle it again.
Put on the A/C high and the high beams.
Put the van in each gear:P, R,N,D,1,2.etc.
Return the engine to Park
Turn off the A/C.
Shut it down.
Now run the ignition key diag test..
On, Off, On, Off, On.
Check for error codes.
How bad is your mileage?
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