hi all, I'm seriously tempted by a second-hand Ampera, but was wondering how the petrol engine performs ( in terms of economy) at speed. Although I do plenty of 40 or 50 mile hops at work, I also regularly travel from Manchester down to the Midlands and South Wales. Most of the time on these motorway journeys I'm sitting at 80 mph. I've read plenty of posts on here suggesting I could expect between 45-55mpg on petrol alone, but wonder if that is the result of using a very gentle right foot. I wouldn't be able to sit at 65mph on the motorway. Thanks in advance.