Most likely cause is a failed throttle position sensor.
When you are not towing during highway use.
Because it does and that's okay :D
low coolant
The EPA range estimate for the 2014 Dodge Durango is N in the city, A on the highway.
Could likely be a dying battery or bad alternator. I would have your battery checked out. This just happened to me and turned out that my battery was bad.
The highway gas milage for a Dodge Dakota varies by vehicle. Average milage is around 16 mpg.
possibly
The EPA range estimate for the 2014 Dodge Charger is 343.8 mi. in the city, 515.7 mi. on the highway.
The EPA range estimate for the 2006 Dodge Charger is 306 mi. in the city, 432 mi. on the highway.
The EPA range estimate for the 2012 Dodge Charger is 343.8 mi. in the city, 515.7 mi. on the highway.
The EPA range estimate for the 2010 Dodge Challenger is 306.0 mi. in the city, 450.0 mi. on the highway.
The EPA range estimate for the 2011 Dodge Avenger is 338.0 mi. in the city, 523.9 mi. on the highway.