I've played around with the gas mileage on my 9er a bunch. Gone through several tanks riding hard, accelerating hard, etc, and I get about what you're seeing, 120-130 miles on about 4 gallons. On "normal driving" (mostly mild with spurts into the higher RPM), I'll get about 150-160 on about 4 gallons. Pure highway, I've seen as high as 180, but that's rare for me.
My goal is simple. It is a complete understanding of the universe, why it is as it is and why it exists at all.
- Stephen Hawking