Thanks to a technologically advanced gasoline direct-injection (GDI) engine, along with tall gear ratios with either transmission, fuel economy is great, especially if you place the priority on highway mileage. In all, the Optima's fuel economy ratings are among the best in its class.
EPA ratings are right up at the top of the class—at 24 mpg city, 35 highway with the automatic, or 22/34 for the Turbo. The Optima Hybrid earns 35 mpg city, 40 highway.
The 2012 Kia Optima gets great gas mileage and is one of the greenest picks among base mid-size sedans; but the Optima Hybrid is even more efficient.
The 2011-2013 Optima Hybrid is one of a set of vehicles found to have overstated fuel-economy numbers. Kia initially submitted figures of 35/40 mpg and 37 mpg combined to the EPA, which allows automakers to self-certify fuel economy. On a confirmation check of several vehicles, the EPA found the Optima Hybrid's actual tested fuel economy to be 34/39 mpg or 36 mpg combined. Owners can register with Kia to receive reimbursement for the gas consumed above and beyond expected levels; more details are found at KiaMPGInfo.com