Concept cars are real too. You just can't buy them, like the car you mentioned.

150mpg is a gimmick. If you plug it in, it uses electrical power and stores it in a battery. A 100kW motor (125HP) powered for 1h would require 100kWh of electricity. At 10c/kWh that is $10 of electricity? They did not list the amount of battery storage or charging efficiency -  60%? So closer to $20?

It uses Li-Ion batteries => safe in a crash? See laptop explosions. Ni-MH is safe but patent holders don't want to license large batteries. Current patent holder is an oil company, AFAIK.

Also, 150mpg if 80% of the trip is not gas powered (on their site). So, if it was not plugged in like on a longer trip, it gets 30mpg. At $4/gal, and since it can drive about 30mi on battery (batteries degrade, so 30mi may be more realistic than 40mi when first out),  that means it would cost $4 to drive it on gas vs. some amount for charging it. Assuming you steal power and can save that $4, it would save you about $1200 a year => 7 years until you get your money back... if electricity was free.

Regardless, gas power vs. electrical power => both costs . The only way to get rid of gas guzzlers  is to have a hybrid where the hybrid gets it's non-battery power from a hydrogen fuel cell (instead of a has engine). The hydrogen is produced ideally from water using solar/wind/nuclear power. It will not make driving tank-like SUVs cheaper, but it will fix the climate change issue. 0-CO2 hydrogen guzzlers

You dont pay for a road tax,congestion charge and of course you have parking for free.

In London there are 60 recharge points where you can recharge it.(200 from spring)