 I stumbled across the Sonata Plug-in Hybrid while researching the Chevy Volt and and Ford Fusion Energi.  I'm glad I did!  Hyundai did their homework with this car.  It's spacious, quiet, refined with a well laid out interior with high quality materials and intuitive easy to use controls and electronics interfaces.  The Limited version has a luxury feel to it with a myriad of features that rival our S Class Mercedes.  Though only rated at 27 miles of battery range, I have been consistently getting 30-35 miles over the last two weeks before reverting to hybrid operation, where it gets an average of just over 40 MPG.  On a 1000 mile trip combining interstate and secondary highways, it averaged about 41 MPG, which isn't bad considering we were going 75-80 on the freeway sections.  On one 70 mile section of Highway 1 in northern California it actually did 48 MPG.  The comfort level is high with excellent ventilated seats, an extremely smooth and controlled ride, and a noise level that's about as quiet as any car I've been in. The navigation/information/media system is outstanding with loads of information and easy to use.  The price at $39,000.00 seems high, but rebates and dealer discount brought the price down over $5,000.00. In addition, the California rebate of $1,500.00 and Federal tax credit of $4,900.00 (?) drops the net price down below $28,000.00, which is a screaming deal for a car with this content and capability.  It has more electric range than the Ford Fusion and a vastly bigger interior than the Volt. The adaptive cruise works very well, as do the electronic driving assists.  There just aren't any glaring flaws or shortcomings I've discovered yet, other than the trunk is a smallish 10 cubic feet due to the battery pack.  Hyundai hasn't just established itself as an equal competitor.  With this car, it leads the pack.UPDATE 8/18/17  Car broke down on 7/26/17 with hybrid warning lights on the dash.  Had to be towed to nearest dealer, where it has been sitting since it stopped.  They were not able to analyze the problem, and after finally replacing a part which didn't fix the problem, now say the hybrid battery needs replacement.  Problem is, the battery is not available and they don't know when it will be!  I had an initial contact with Hyundai customer care, and was promised they would look into it and get back to me.  That was 12 days ago and I have heard nothing back, despite leaving 5 messages which weren't returned.  Customer service seems non-existent.  I am definitely done with Hyundai, and this will probably end up as a California Lemon Law claim.  Buy one of these at your own risk!UPDATE NUMBER 2 2/21/18 Hyundai purchased the car back from me, paying back all of my costs less a fair pro-rated amount for miles driven.  In the end Hyundai was fair and did the right thing.  Shame. I really liked the car.