04 AWD Fx35 LOW MPG

So after taking the battery off and driving in normal conditions, it wont go above 12 MPG.. As of now i reset it and it's only 10 MPG.

No check engines at all, new spark plugs, filter looks clean.

It's just sad that i can get double that mileage driving carelessly on a Honda CRV.. Meanwhile i accelerate very slowly on the FX35..

As for the computer calculating not being accurate, i think it is since my dad pays twice as much at the pump compared to a honda CRV..

Right now he's driving the CRV daily and fills up once every 2 weeks, compared to once a week on the FX even though the FX35 has a large tank..

I'm guessing it's normal? Damn it is fun but sadly we will sell it by summer because of the mpg :(
 
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I took a bunch of data points when filling up while driving to/from CA last fall, and the computer was usually pretty close, although occasionally up to ~2mpg off.

I've noticed that averages for me seem to be about 12-14 pure city with stop and go, 16-18 for mixed, and about 23-26 highway ~75 mph.
 
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