You're right I should have mentioned that. But It gets complicated because a family would probably use this car for their longest trips/commutes, would use this one more then their secondary car for elective trips. Also this is grouping in single person households with coupled households and its including people who dont drive to work and the states containing the most people who would buy this car are also the states with higher than average gas prices as well. I haven't been able to find the statistic on how much an average Californian who drives to work spends but I think its on the order of hundreds of dollars in savings per month, which this article doesn't mention.