Highway -- 18.6
City -- 15.5
As of today I've had my Nitro for 6 weeks and have driven 1790 miles. This is still a shock stepping up from a 30+ MPG Ford Escort ZX-2. I'm hoping that after I get about 3000 miles on it the mileage will go up but I doubt it. If anyone has any information regarding this myth I would love to hear from you.