Same article as Steve linked to. So, if you want to be 'green' owning a car, don't buy new, keep your old junker running as long as possible. Except that the fuel for them will run out one day...
Graham (G4FUJ)
Sold L44FOR 4/4 Giallo Fly '11 MINI Countryman Cooper D All4 '90 LR 90 SW
