I get about 200 - 210 mpg but am running a few mods, you guys are lucky, super over here is about $7-$8 per gallon. The s is an expensive car to fuel but worth every penny/ or cent

 

I get 26-29 MPG on the highway out of a 240 hp naturally aspirated 2 liter motor. I get 6 MPG on the track. I'd say that's a pretty damn good compromise between mileage and performance.

Find me a 120hp/liter NA ULEV motor of any displacement that gets better mileage

 

Around town, the last couple of fuel bars go real fast, so I fill up at about 250 miles.
On the drive up to and back from Monterey, this last August, I got 32-34 mpg at freeway speeds. (75-85)

 

i get 20-25 mpg.....exactly what it's rated at

 

If you have never put in more than 11 gallons and you have gotten up to 350 miles on a tank full of fuel, you would have gotten 31.8 mpg. According to the Helm Manual, the fuel tank holds 13.2 gallons. If you used say, 12.2-12.7 gallons, your S2000 would take you 387.96-403.86 total miles. You would still have 1/2 to 1 gallon of fuel in the fuel tank.

I myself, have never used more than 11.8 gallons at one time.