After your next up visit to the pump...please post how many miles you record on half a tank. Please also indicate year, engine size, mileage, manual or auto, octane, city/highway %, and if you have ever replaed your 02 sensors.
mine:
2000
3.2
48K miles
manual
93 only
90% highway 10% city
1 o2 sensor replaced
half tank mileage- 192 miles
p.s.
93 Octane on 2-18-08 $3.02