All the Ex'es should be around 30mpg.
What maintenance have you done?
How hard do you drive?
When was the last time you put in injector cleaner?
New spark plugs?
New air filter?
Oil change?
Check your tire pressures?
What size wheel/tire are you running?
When was your last alignment check?
Do you have a huge stereo system?
All these can kill mpg.
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