You must have very few miles, or be basing your statement on the lie-o-meter, or both. Or do you have the V6 with eTorque?
I have the Hemi w/eTorque, 4WD, and 3.92 gearing.
I have been tracking my mileage with Fuelly since I got the truck. So, about 7000 miles now, all hand calculated.
My mileage over the whole time is 14.5 MPG. Over the last 10 fill-ups, the average is 15.3.
Sometimes, the lie-o-meter is right on with the hand calculated. But, just for example, my last fill-up was 31.3 gallons. The lie-o-meter said I had gotten 17.2 MPG on that tank. The hand calculation came out to 15.1. Seeing as how the hand calculation is a much closer match to the lifetime stats, I'm inclined to believe it. The lie-o-meter is just random. I record every fill-up in Fuelly and I add a note to every fill-up with what the Lie-o-meter said for that tank (just before I reset it and the Tripmeter B - I reset Tripmeter A every time I get an oil change).
I HAVE gotten as high as 21 MPG (according to the L-o-M), over a stretch of 50 miles or so, where I was driving on cruise control going 60 - 65. But, by the time I actually filled up again, the average had dropped from 21 back down to a more normal number for me. I have never gotten higher than 16.7 on any hand calculated fill-up of more than 10 gallons.
