Not necessarily an economy question, but does anyone else's fuel gauge read lower than what's actually in the tank? I've only owned my tree since November, but whenever I fill up (usually around 1/4 tank) my fill is only ~15-16 gallons. I've had my fuel light come on once, and 19 gallons filled it up. The only thing I can think of is Toyota was trying prolonging the life of their fuel pumps by encouraging their customers to not wait until dead E to fuel up, but 7 gallons seems like a pretty large reserve.