But first, let's take a look at why you have to be careful using manufacturer websites to make good purchase decisions...
This is from the Prius Plug-in webpage:
From looking at this, who the hell wouldn't want to own the Prius over the Volt? I mean, its over $7,000 cheaper than the Volt? Look at all that extra room!
Examined a little more closely, the price difference between the Volt and Prius is only about $2,100 when you factor in that the Volt gets a $7,500 tax credit and the Prius only gets a $2,500 tax credit. And with that extra $2,100, the Volt provides you with an EPA estimated electric range of 38 miles when the Prius only offers you 6-11 miles of electric range, depending on if you blend the EV mode with some gas or not (the Prius will burn gas above 62 MPH or if you accelerate too hard: the volt doesnt burn gas in either of those scenarios during your EV range). But people purchasing electric cars don't care about that stuff... Its the legroom, right? ;)
I figure most people wanting to buy an electric car actually want some significant electric range, so that's a pretty big important point to omit on your advertisement. Many people are going to fully qualify for the tax credit, so looking at the pretax cost as a comparison is also a bit wonky.
So, let's take a look at some comparisons, done 'Voltowner' style... I am absolutely biased. But I've done my best to show the differences between three cars in a similar price range, and highlight things that I believe will be important to people looking to buy electric cars. I am making a comparison between the 2013 Chevy Volt, 2013 Prius Plug-in, and 2013 Ford CMAX Energi. I have done my absolute level best to provide accurate information below. If there are typos or technical inaccuracies, all you need to do is comment below and I will fix them.
I think you'll find enormous value in the Volt, even though it's slightly more expensive than the other 2 vehicles, but depending on your circumstances, picking one of the other two could be the best choice for you. I have colored a cell green if I deem that car to be the category winner. The cost per mile metric is just for electric miles. Obviously you get a lot more electric miles with a Volt than you do the competitors, so while the Volt may not be 'as' efficient on electricity (the difference in monetary terms in minimal), it is 'efficient longer' than the others that convert to burning gasoline much sooner. I probably don't have to tell you that gasoline is going to cost a lot more than 4 cents per mile.
* The Cost Per Mile of EV Capacity is a metric I came up with that should give you an idea of what you are paying for each mile of EV capacity. It should be able to give you a value comparison of the 'bang for your buck' of EV range.
** Thermal Management Systems are important in extending the life of a high voltage battery. The Volt wins as its thermal system is considered superior in laboratory tests for maintaining a constant temperature.
*** GM has established the gold standard of HV battery warrantees. They actually warranty the battery for capacity loss, which is a huge protection. The other manufacturers generally state that degradation in batteries is to be expected, but they don't pin down an exact capacity loss which will result in a replaced battery.