To be clear, I wasn't talking about music, wifi, brightness on the car, I was talking about it on my Thinkpad. I'd only use units of time (hours) to measure a laptop's battery life, I wouldn't use time as a unit for measuring a car's battery capacity.

Taking car rides in my buddy's Volt will only get us from SF to Mountain View, and then it will switch to using gasoline.

How you accelerate/brake/etc, city vs. highway driving, and following distance from other cars ("drafting") can really affect the range...