Try [unleaded] 87 octane. If it does not "ping" excessively you should be OK
If it does "ping" try 89 Octane
It should be the same as my '94 SC2 which is 12.8 gallons.
12
The fuel pump for the 2001 Saturn SC1 is in the gas tank
Trouble code P0404 means:Exhaust gas recirculation circuit range/performance
10 gallons
Approx. 11.5 gal.
in the gas tank
Near 12.8 gallons
"gas mileage generally goes from 25-28 mpg in the city to 34-40 mpg on the highway" - http://www.cargurus.com/Cars/Overview/-c5816-1995-S-Series.html
The vehicle PROBABLY has a sticking injector. Try a little injector cleaner in the next take of fuel. If that doesn't help, there may be more serious problems.
Saturn is a gas.
Saturn's run just fine on regular fuel; in fact, all fuel should be as "fresh' as possible to minimize potential problems. The best grade for your Saturn will be partially determined by your altitude. If you live at a higher altitude, you can get by with lower octane.