businessweek.com — The 2012 Grand Cherokee SRT8 gets 12 miles per gallon in city driving. According to data from the U.S. Environmental Protection Agency, it's Jeep's least efficient vehicle in the 2012 lineup. But the SRT8 has gotten good reviews for performance (it goes from 0 mph to 60 mph in 4.8 seconds, for example), and as the above chart shows, awesomeness can come at efficiency's expense.