Not a Nismo, but my Z is a daily driver and I drive 90% highway (with stop and go traffic) about 35 miles to and from work. I average around 22-23mpg total and tend to drive on the slightly spirited side. I'd say I average around 70mph on the highway. I've gotten over 30mpg on only Highway driving so expect about the mid 20's for your situtation. This question is kind of moot though. If you're really concerned about mpg's, there are plenty of economy cars around. Combined mpg's of mid-low 20's is pretty reasonable for a sports car so I really wouldn't worry about it. You'll spend over $70 to fill it up no matter what.
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[09][MB][6-Spd MT][Touring][Stillen Gen III][K&N][Borla CBE][Evo-R]
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