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None if they're all working.
 

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You don't need to run 89. You could replace some gaskets, clean your throttle body and get a k&n drop in filter, run some injector cleaner, seafoam your intake. All that is cheap and if it doesn't add any mpgs, it'll at least clean everything out
 

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Plus its winter. If you are doing any city that's about right. 34 with mostly hwy was what I was getting stock.
 

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You should notice a mpg difference with 87 compared to the 89 you're running now
 

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yes i most curtainly do..
another random question?
do all fuel pumps on my type of car shuts off at 112 MPH?
This engine cut-off is set according to tires that come standard with the car. Tire speed rating is the criteria here for top speed cut-off.
 
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