I am in California and on a rate plan of $0.24/KWh (non-peak) and $.31/KWh (Peak).
I am assuming everytime I charge the 11.6KWh battery, I am spending anywhere between $2.88 - $3.72 for electricity that gets me around town for about 18-20 miles. Though driving in PURE mode may seem like a good option (at least to me), unless the gas (91) prices go above $3.72, then it's not really that cost effective. My other car (AUDI Q7, gets me around 19 mpg) around town. More on the freeway.
The Volvo does get me more overall MPG, I refilled for the first time today, I think the actual mileage was around 38.8 MPG even though the sensus driver performance says it's 42 MPG. Still pretty good, I am happy. Lovely car and fuel efficient!
So not really a big difference with PURE mode or am I missing something?