888-279-4277 A powerful engine doesn't mean much if it can't pack a little efficiency. The standard 173-horsepower I4 in the 2012 Dodge Journey will get up to 26 hwy mpg and 500 miles on a tank of gas. Even with the 283-horsepower 3.6L Pentastar engine under the hood, one of Ward's 10 Best, you'll get a very satisfying 25 hwy mpg.