your celica gets 20 MPG combined according to EPA, if it was GTS. If it is 140hp, then FRS will feel like you are in drag racer.
Celica was a great car at the time. FR-S is on another plane of existence.
FR-S is purpose built RWD sports car. It is built to be tracked. What does that mean? Special chasis, special suspension, special engine, short gearing for the transmission, roll cage easily installed with mounting points already there, LSD in every model.
You cant compare it with any FWD car, it is completely different experience.
And thats why all the mags and reviewers from every country in the world are going bonkers over the car while they laugh at the Mustangs, Camaros, Velosters and Genesis.
If you are into cars, there is no question that you will be able to turbo this thing yourself for $5k with intercooler and then you have a monster at your hands that almost nothing will touch.