Yes a little unfair test of BMWs knee jeck cobbled together design.
The Tesla is better, but still based on what could be done, when it was first designed. Todays traction batteries are far better.
The Prius is such old technology its a joke. The most advance electric car at the moment is the GM Volt on so many levels. The battery thermal management is key to range and longlife.
The transmision is very clever with 2 electric motors that mainly move the car and a petrol IC engine that can drive the small electric motor as a generator or drive through it, to assist in moving the car. Can do 25/50 miles on electric, with full performance to 70mph 0 to 60 mph 8.5 sec on electric only. 4 seats plus a boot. 300 mile range on petrol, 9 usgal tank. Cost about $42000 dollars. GM expects to build 25,000 in 2011, on sale now.
This is what can really be achieved in a BMW Mini shell.
Not built by a car company, but a little inovative electric motor manufacture.
A lot of rubbish written about charging sockets.
In the UK the sockets are rated at 100% so a 32amp,
which is a standard ring main rating can deliver this 100% of the time.
Not a big deal. All UK plugs are rated at 100% duty cycle. US are 80%
so must be derated when used for long term loads, so example a 20 amp is only 16amp
40 is 32.
Also the US has bi phase power on 240 volts, so need double pole ganged breakers similar
to continental Europe . Also the breakers are there only to protect the wiring not the charger, it should have its on breakers built in.
What other rubbish has been mentioned.
Hydrogen, what a dead duck, do the energy audit, 12.5% overall well to wheel.
Low power density, difficult to store/transport and so much clean water would be needed
to make it there would be none to make tea with. Very poor way to transport energy about.
Electrons down a piece of wire is better with low energy losses.
So what is needed to make electric cars 100% main stream.
Petrol/Diesel is about 12 kw/kg but ICE is only 20/25% so realy means 3kw/kg.
So a battery is needed that can store about 2.5 to 3.5kw/kg as
electric motors are at least 90% efficent.
Enter the Lithium Air battery at 10kw/kg, achievable 2.5kw/kg.
This is the holy grail of batteries, low cost fast charge or casset change of Lithium for instant charge. About 15 years away.
So why do we need to go electric, what would happen if there was no oil tomorrow.
Everything would come to a stop, people would starve to death, look at the last
fuel depot blockade that was getting serious at the end.
Once we are all electric and Lithium is not a rare metal, power can come
from many sources and with a Europe wide High voltage DC super grid being planned. Electricity could be moved long distances with low losses, so will come from solar stations from around the Med. Iceland will generate from volcanic heat sources and export on under sea cables plus Nuclear from around Europe and we may have cracked nuclear fusion by 2020. See Focused Nuclear Fusion. 2050 will be a whole new world you never dreamed of, but we have to get off oil to do it.
So its not about MPG its about energy security and being masters of our own future and not being controled or dictated to by the Middle East or Russia.