At full throttle at 15,000 rpm, it drinks a little bit over 1.7oz per minute
On 14oz, figure on 12oz of good usable fuel, and somewhere around 6-7 minutes of flight time.
A 16oz tank will help with another minute or two.
If you are in the market for a different tank, may I suggest the Tetra 500 cc bubble tank. (appx 17.5oz) Call Central Hobbies.
www.centralhobbies.com
Never worry about a fuel system issue again (as long as you vent and fill it properly). Plus, there is no 'unusable' fuel. You can run it down to the very last drop and the mixture will never change.