My car's gas mileage

I own a '92 Geo Prizm. According to this site: http://www.fueleconomy.gov/feg/findacar.htm, it should get 25 mpg city and 29 mpg highway. I do a fair amount of highway driving, around 1/2 to 2/3 of my total mileage.


Actual mileage:

1st tank: 34.2 mpg

2nd tank: 31.6 mpg

3rd tank: 33.8 mpg

4th tank: 34.7 mpg

Average: 33.6 mpg


So I guess my car is overachieving.



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