Probably not for long trips like London to Scotland, but don't forget they also have bigger gallons in the UK.
When taking my Volt on short day trips to nearby towns, I was surprised by getting better than the 50 mpg that I would expect from a Prius. I get 60, 80, and offen more than 100 mpg for 80-150 mi round trips without charging. I usually take shorter, slower routes and hypermile to get the first 40-50 miles on electric, and continue hypermiling after switching to gasoline. I had considered the 35 mile EV range insignificant for road trips before I bought the car, thinking that a Prius would be better for these trips. If I had done the math before hand (and known that I would take up hypermiling), I would have realized that the Volt is best for everything but longer overnight trips.
I have been extremely happy with the performance of my Volt. I expect that Ampera owners, in the land of expensive petrol, will be even happier.
GSP







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