That's partly because the USA has artificially low gas prices. Over here, diesel is around 7$/gal and gas is around 6$/gal. That adds up quickly, especially vis-a-vis 0.2$/kWh.

Though, to be fair, that one specific case is a bit extreme (someone with a 100-150km round-trip daily commute and a not-especially-economical car). My commute is about 20km round-trip daily, but I also end up saving money over the long term because a lot of that time is spent sitting idle and wasting gas with nothing to show for it.