How many miles per gallon does a Nissan Frontier get?

I've got a 2005 Nissan Frontier NISMO 4x2 and I get about 21 mpg each tank. That's with city driving and about a 30 mile commute to work on the highway. Strictly highway is a little bit higher than that around 23 or so. I don't drive like a maniac or "gun" it very often either... you can really drag the MPG's down depending on how you drive it.