Uh, the Jetta TDI gets 62mpg in practice (someone did a 5,000+-mile trip going counterclockwise, west across the northern U.S. and then east along the southern U.S), while its gasoline counterpart boasts 32mpg on the highway and 27mpg in the city.
1. You're citing MPG from a Volkswagon diesel car? Can we turn off most emissions controls on the gasoline engine too, or is that considered cheating?
2. You're comparing someone's hypermileing adventures in a TDI on low roll resistance tires to EPA estimates for a 2.0L normally-aspirated, automatic transmission model. That's not remotely apples-to-apples. The EPA numbers are 45/36/31 for a Jetta TDI automatic, and the 1.8L turbo has better numbers than you're reporting with 20% more HP than the TDI (180 hp; 37/29/25). So, again, the comparison is crap.
3. Texas fuel cost is also almost half that of California's. 5 cent/kWh electricity is the same as $1.80 regular gas on a cost-per-MJ basis.
Why don't you pick one state, one set of roughly equivalent cars, and one style of driving instead of making crazy claims that not only can you halve operating costs by driving a diesel (no, you can't), but drop them by 87% by driving electric (again, no, you can't).
While diesel is more efficient and electric even moreso, the difference is not nearly so large as you claim. In the meantime, diesel has self-evident problems with particulates and particulate emissions controls, and electric has the minor problem that you cannot deliver that much power to that many people over the existing grid. Once penetration hits 5-10%, you're not going to get 5 cent/kHr electricity anymore if only because of the transmission costs increases that you will see for the next several decades. Many places already risk brownouts on extremely hot or cold days, and now you want to add loads that make AC and electric resistive heating look like someone left their lights on in comparison.