The Chevy Volt does save you on maintenance (as an owner I can attest to that) however you have a point since it is both EV and ICE.  I had to put $20 back in February and still have about $10 left of that.   

But why are you forgetting the Chevy Bolt before you say GM does not want to commit to the EV market.  They beat Tesla by a large margin in getting this out to market and it does close to 400kms and is pure EV.  

Rifleman, why the Chevy Volt is not selling more is completely beyond me and I can only postulate it is because people are afraid of change and research.  It is a fantastic car and driving EV is preferable to ICE.   Most people drive under 50kms a day and the Chevy Volt (get about 85kms in EV) means you never have to fill up unless you are going away.   

Workhorse a truck is coming out next year with the Volt platform but it will get 125kms of pure EV driving before ICE kicks in.