Question for all you knowledgeable folks here: According to the manual, the V6 gas tank capacity is 16 gallons but when I purposely ran the display to 0 miles left until empty tank, I immediately went to a station and filled it up. The fill up at the station read 14.5 gallons. Does this mean the display is wrong and that actually we have about 1.5 gallons until we completely run out of gas?