Great Festiva memories
I had a 1990 5-speed Festiva that I bought new and put 120K on- great car.
At the time I had a 30-mile commute in rural/suburban roads and I averaged between 40 and 44 mpg, without coasting or shutting off the engine, all stock including air pressure. The only time gas mileage suffered was when I went for long distances on the interstate- driving 65-70 dropped mileage to 38.
I think your best results will be from aerodynamic improvements. Good luck!
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