We had an RX-3 wagon for a few years. I remember it was fast, backfired a lot, and got terrible gas mileage for a subcompact.
I never got to drive it as my folks traded it off before I got my license. Too bad, it had a five speed, and an eight-track tape deck!
Yes terrible gas milage. Mine had a holly 4 barrel carb, and was tuned to almost 200hp, we had to de-tune it back to about 180hp just so it would idle. Fun car, had fun beating up Rx-7’s which had the same engine but weighed more.