This is all very amusing.
I don't think people realize just how bad the gas mileage is on the RX-8. Official numbers quote it (manual) at 22mpg city / 31 hwy. In reality it's more like 16/22. This thing is thirsty. It's called a 4-seater but with the legroom at the back, it might as well be a 2+ double amputee.
BUT.... It is fun to drive. Great fun to thrash around on a track. It's just not very practical.
The New Z is the 370, so if you are looking for a 350 you should be able to find one well below MSRP. Very hugging seats. Very firm suspension, but a great driver's car and great for modding with lots of aftermarket support if you're into that sort of thing. Only 2 seats though so again not very practical. But then cars in this segment seldom are.
Good luck with your purchase!