The 2014 Kia Rio is reasonably good on gas, thanks to its engine's direct injection technology, and the car's rather lightweight construction in general. But with no models in the lineup getting more than 32 mpg Combined--or even hitting the 40-mpg highway mark--it's not an especially high achiever in fuel economy.
In theory, the Rio is also offered in an Eco model, which includes ISG (Idle Stop and Go) technology that will automatically turn the engine off at some stoplights to save gasoline and automatically restart it when you lift off the brake. Also included in the package are low-rolling resistance tires and a few aerodynamic improvements. We say 'in theory,' because Kia still has cold feet about delivering the package--although we hope they do for 2014.
The 2014 Kia Rio is rated at 28/36 mpg (31 combined) with the automatic transmission or 29/37 (32 combined) with the manual transmission. Get that Eco package and ratings are up to 30/36 mpg (32 combined).