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 I have a 2006 3.7L and noticed I am only getting an average of 15mpg. Is this correct or could there be something wrong? I usually drive in the city but, sometimes on the
I just completed a trip of 3379 miles.
From NE Ohio to starting point of NYC. Included in our trip was destinations in Connecticut, Rhode Island,New Jersey,Maine, New Hampshire and Vermont.
A larger quantity of my mileage was mountain roads in Maine, New Hampshire and Vermont.
I would guess 1/2 the mileage was 2 lane mountain highways.
I even had 4hrs at 20 mph on rte 95 north of NYC
Included in this was climbing and descending Mount Washington 1st gear for 8 miles.

My average for the trip was 18.9 mpg.
I also have 06, 3.7 and stock tire size , no lift, Iridium plugs (never noticed and increase in milage because of them) Mobil 1, current mileage is 106,730.
On the top was the mopar roof bag carrier, LOADED.
So your mileage seems low to me.
A shorter trip that I checked mileage on was one to Columbus and that was 20.2.
I don't drive with a heavy foot and if speed limit is 65 I usually set the cruise around 72.

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When I drive around town, I read 14.8mpg, what gives?
My around town mileage is around 16.9.

Hope this helps,