They fixed the EPA ratings on the fueleconomy.gov website. (Only two listed now.)
If you remove hybrids you can see that city range for almost all cars runs from about 8 mpg for a Murcielago to 29 mpg for a Yaris. So there is only a 21 mpg range for almost all cars.
To me that means 2 mpg difference in the city is pretty significant.
Another way to look at it would be if the S5 could manage just 2 mpg better city and highway it would no longer be subject to the gas guzzler tax.
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Based on your driving style it looks like you'd manage 20/31 in an A5 3.2 manual.
Keep in mind I'm quoting the much more accurate EPA 2008 figures.








