The Hyundai Ioniq Hybrid scores an EPA-estimated fuel mileage rating of 58 miles per gallon combined in its least-expensive Blue trim level. Stepping up to the SEL trim will add an extra layer of luxury goodies for $24,785, and the top-level Limited model will cost $28,335. Those two models earn EPA ratings of 55 mpg combined, which is still better than the 52 mpg combined estimate for the Prius.
Hyundai's Ioniq Electric is the most efficient vehicle sold in America, with an EPA-rated MPGe (miles per gallon equivalency) of 136. Its range, though, is only 124 miles, which will certainly limit its usability for some potential buyers. We've heard that an updated Ioniq Electric will come by 2018 with a range of over 200 miles, which would allow it to properly compete with the Chevy Bolt and upcoming Tesla Model 3.
Toyota doesn't currently off a fully electric Prius, though the $27,985 Prius Prime does get a plug for extended EV-only driving. Hyundai has yet to announce a price for the plug-in hybrid version of its Ioniq hatchback, though we do know it will travel up to 31 miles on electricity alone.