According to fueleconomy.gov the Prius is rated 51 city/48 highway and the cruze eco is 28 city/42 highway. I currently live in an area similar to yours with speed limits and stops signs every two miles or so. My current tank is getting 43 mpg. When I am on the highway holding at 60 mph my scangauge shows me as getting nearly 53 mpg. If you drive the cruze slow, with in the speed limit, and no excessive braking you can easily exceed the EPA estimates. If you plan to stay away from the city the cheaper cruze eco may be the way to go.