i own a type RB and spirit R type B
both run very well
the RB has exhaust, cooler, pods and runs about 400km per tank
the spirit R runs the same except its stock
all i can say is if your worried about fuel efficiency then the car isnt for you
but at the end of the day after a car wash and nice cruise you forget about the fuel costs
i've been importing cars for years now and driven almost everything out there and in my opinion its the nicest car, but then again im an rx7 fanatic. Handling, response, and breaking are so sweet compared to most other jap cars ive driven.
the back seats are pretty much useless unless you have very short mates, my gf is about 5 feet high and she had to sit sideways across 2 seats the last time she sat back there.
try have another few grand lying around for reliability mods when you buy the car for ast radiator etc or just spare cash incase you don't do those mods and it breaks on you.
it really is more of a weekend cruise car, i drive a mr2 sw20 as a daily
goodluck with your decision mate thats my 2c