Brand of Gasoline

[Ales]

According to Google maps, Sedona to Phoenix is 234 miles round-trip, which
Fay should
easily be able to do on well less than a tank of gas, even crappy gas.
 There is something
else going on here, or at least there was until this most recent trip.
 Thermostat stuck open,
now finally unstuck?  Something about the pump at her usual station that
prevents her from
getting a full tank?  Fay, how much gas do you usually put in when you fill
it up?