Top 10 Top 10 Most Fuel-Efficient Hybrid Cars by Frédéric Mercier May 20, 2019 Photo: Kia3. Kia NiroKia's small crossover is available in hybrid, plug-in hybrid and all-electric variants. Even with a standard hybrid powertrain, the Niro is remarkably efficient at 4.7 L/100 km. « PreviousNext » Share on Facebook Share: