I registered last year as an e-Pioneer with Vauxhall and paid my £150. A month or two ago I got to drive an Ampera at the Motor Expo in Canary Wharf and even had a chance to chat with Quentin Wilson who is an advocate of this car. But something is bothering me about consumption that I can't work out. They say that a full battery will do around 50 miles and full range of 360miles with the 30-litre 6.59 gallon tank gives an extended range of 311 miles. That to me says 47mpg. But I keep reading great figures of 175mpg. I can't work it out, can you?