Does this sound too good to be true? Chevy are claiming their upcoming 2010 Chevy Volt, a plugin electric hybrid, will do 230MPG for in city driving. Wow. Now we’re talking some serious milage. That much more attractive to me that squeezing 40-50MPG from a Prius – which can easily be met and even bettered by most new diesel engines. Shame the clean-burn European diesels aren’t more widely available in the US.