What type of gas are you using and at what alcohol content? Try from different gas stations and recheck the results.
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I have had similar results with cars. A number of them have an instant mpg readout & that has shown me that slightly brisk acceleration is better than taking a whole mile to get up to road speed. It doesn't sound like that should work, but I think taking advantage of engine torque at a little higher rpm is the reason. I say get on it a little for a tank & see if there is a difference.Lots of factors already mentioned that affect gas mileage, but one other thing to consider is that "conservative driving" doesn't always mean better gas mileage overall. Accelerating to your cruising speed quickly will usually yield better mileage than a very slow acceleration. I've messed around with my acceleration rate in the past from one tank to the next and anecdotally noticed a 2-3 MPG increase with more aggressive acceleration, but moderate cruising speeds.
87. After reading your posts I may try a higher octane. Did not know it would have such an impact. Thanks.20 is low and I would contact the dealer. I have awd and have been avg close to 28 with lots of highway driving. 23-25 in city likely. You running 87 or 92 gas?