looking at basically, the cost of a total combustion engine vehicle, is $100 per kilowatt hours, edwif lent sea, for battery, is $100, per kilowatt hours so the difference between -- vehicle is offset substantially by the grants that are currently available, if we take a regular vehicle, by comparison -- we have done this as part of our plan -- with the grants and incentives, they come down with 5-$7,000 in termses of purchase price, and the difference between regular vehicle and one of these vehicles but that's about the amount right. in terms of leases because the vehicles need these vehicles to meet the regulatory requirements, the lease deals on these vehicles are pretty incredible. i'm not doing car commercials, but [laughter]. i think you could quite comfortably, in the city of san francisco, lease a 2-3 year lease on an ev for under $200 a month. which is roughly, by comparison an ice equivalent 100-$200 less >> what is the price differential filling my car with electricity, versus filling it with oil? >> we compare them? >> it's a quarter of the price to fill it. thank you. >> just to c