How about 74 mpg
00:21, 05 Dec 2008
I've been listening to people claim that 30 mpg and greater is impressive (for reference my 10 year old Chrysler V6 convertible still has an EPA rating of 28-29mpg), the cutting edge of Volkswagen, the Polo Blue Motion has a fuel efficiency of 74 mpg. 
There is one caveat to this, it is diesel based, given far more cars in europe run on diesel, which gets more fuel efficiency per gallon of fuel.
If it were to be sold here, current prices put regular gas at around 2 dollars, while diesel is 2.9 dollars. Equivalently this would mean on a cost comparison the equivalent of getting 51 miles per gallon... still very impressive.
However despite it having 99 grams of CO2 per km, while the Prius is ~102 grams/km, its being kept out due to failing to meet fuel efficiency standards. These are the same standards that SUVs are exempt from...
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