A lot of posts on this forum revolve around the efficiency of the Volt and getting the most out of the car's range. The 40-Mile club . . . Posts on if, how, why, and when running in Mountain Mode improves CS efficiency or not, and how to use it best . . . should you or shouldn't you drive in L to gain a few tenths of mile per kWhr . . . "games" you cam play with the Climate settings to improve range.
The nature of the car, and its displays, promotes awareness of and efforts to improve energy efficiency. I suppose the nature of the drivers has something to do with it, too.
And I dove into that whole energy efficiency thing for the past two months since I got the car: I worked at it until I got up to 47 miles on a charge back when it was warmer (43 miles in a day with an estimated 4 left when I got home), etc. Calculated mpg equivalent and miles per kWhr and all that . . .
IT GOT REALLY ANNOYING after a while. I was paying more attention to the car, not to my errands and other, more important things. Whenever I went everywhere I kept obsessing on whether driving this way or that would save a few watt-hours of energy. ENOUGH!!!!
Last Monday it was really cold (for NC). I did no pre-heating. I got in the car, put Climate in comfort and cranked the heat up to 72 degrees, turned on the seat heater, put it in Sport (I always do-like the feel), and L (not for efficiency, I like the engine braking rather than the coasting of D), and drove to work just like I would have in my old Lincoln. I went through the Starbucks as always, but left the car window down while at the drive thru window, with cold air wafting in that battery power would have to heat up.
AND EFFICIENCY WENT DOWN THE TOILET, BUT I DON"T CARE!!!! Even in cold weather, I used to get to work (11 miles) and the car would estimate it had 27 - 28 miles of range left. Last Monday, the first day of my "I don't care" routine: it said I had 18 left. Fine - I'll get home on electric and if not, there's a full tank of this stuff called gasoline. .
After a week of this, the car is entirely satisfactory - finally. I get in, I start it, and I drive to work -- the errands and home in the eveing. I never ran out of battery. I never worry or focus on the car. It's doing just what I bought it for - finally.
I love it.