Just saw diesel going for £1.80/L on the A303 as I whisked past on the SR/F.
Cas 
Diesel was going for $6.10 a U.S. gallon yesterday around here. I haven't checked today. Electric power is still around 35 cents a KWh in northern California, but that is scheduled to increase by about 30% later this year. My Zero, ridden within the speed limit, will use roughly 15 KWh to travel 90 miles. So a savings over current gasoline prices, but not by as much as I would have wished. I might add that three of my ICE motorcycles get between 60 and 70 miles per gallon at those same speeds.
My Saturn station wagon gets 26 miles a gallon around town and 32 miles a gallon on the highway. So riding both electric and a motorcycle does add up to a significant savings over time.