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fuel economy

We just completed a 500 mile trip at 75 MPH, 4 people, two dogs, plus gear. So figure about 600lbs of people and gear. 17.59 MPG calculated by hand. By myself going 80 MPH on the reverse route of this same trip I got 18.3. 420 HP engine pushing a 5400lb vehicle...that seems about right. Also I run 87 octane.
 
I'm on average of 17ish through all my mixed driving. I can't complain though I take my dog every day to the park that is a mile away. I haven't driven a long stretch of highway again since putting on the factory 22's, but I feel like these things affected my mileage a bit. I'm on 3.92's and a 33 gallon tank.
 

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