Maybe the code is the last 4 digits of the key code. The owner of the car could have set there own 4 digit code also. Maybe the last 4 digits of the vin, Beware
Welcome to the club The milage should be around 19/25, 19.8 gal. tank. My low gas light comes on with about 5 gal in the tank. Heck, That's another 100 mi. or more on the highway.
Sounds like the parking break is dragging, Apply the parking break all the way and release 6 - 8 times as they are self adjusting. Try this and get back with us.